diff --git a/scripts/collection_from_items.py b/scripts/collection_from_items.py
new file mode 100644
index 000000000..59f0d33a1
--- /dev/null
+++ b/scripts/collection_from_items.py
@@ -0,0 +1,69 @@
+import argparse
+import json
+import os
+
+from boto3 import client
+from linz_logger import get_log
+
+from scripts.files.files_helper import is_json
+from scripts.files.fs import read, write
+from scripts.files.fs_s3 import bucket_name_from_path, prefix_from_path
+from scripts.stac.imagery.collection import ImageryCollection
+
+
+def main() -> None:
+    parser = argparse.ArgumentParser()
+    parser.add_argument("--uri", dest="uri", help="s3 path to items and collection.json write location", required=True)
+    parser.add_argument("--collection_id", dest="collection_id", required=True)
+    parser.add_argument("--title", dest="title", help="collection title", required=True)
+    parser.add_argument("--description", dest="description", help="collection description", required=True)
+
+    arguments = parser.parse_args()
+
+    uri = arguments.uri
+    collection = ImageryCollection(
+        title=arguments.title, description=arguments.description, collection_id=arguments.collection_id
+    )
+
+    if not uri.startswith("s3://"):
+        msg = f"uri is not a s3 path: {uri}"
+        raise argparse.ArgumentTypeError(msg)
+
+    s3_client = client("s3")
+
+    paginator = s3_client.get_paginator("list_objects_v2")
+    response_iterator = paginator.paginate(Bucket=bucket_name_from_path(uri), Prefix=prefix_from_path(uri))
+    for response in response_iterator:
+        for contents_data in response["Contents"]:
+            key = contents_data["Key"]
+
+            file = os.path.join(f"s3://{bucket_name_from_path(uri)}", key)
+
+            if not is_json(file):
+                get_log().info("skipping file as not json", file=file, action="collection_from_items", reason="skip")
+                continue
+
+            item_stac = json.loads(read(file).decode("utf-8"))
+
+            if not arguments.collection_id == item_stac["collection"]:
+                get_log().info(
+                    "skipping file as item.collection does not match collection_id",
+                    file=file,
+                    action="collection_from_items",
+                    reason="skip",
+                )
+                continue
+
+            collection.add_item(item_stac)
+            get_log().info("item added to collection", item=item_stac["id"], file=file)
+
+    valid_item_count = [dictionary["rel"] for dictionary in collection.stac["links"]].count("item")
+    get_log().info("All valid items added to collection", valid_item_count=valid_item_count)
+
+    destination = os.path.join(uri, "collection.json")
+    write(destination, json.dumps(collection.stac).encode("utf-8"))
+    get_log().info("collection written", destination=destination)
+
+
+if __name__ == "__main__":
+    main()
diff --git a/scripts/create_stac.py b/scripts/create_stac.py
index 618dcf228..a623d6cef 100644
--- a/scripts/create_stac.py
+++ b/scripts/create_stac.py
@@ -19,41 +19,40 @@ def main() -> None:
     parser = argparse.ArgumentParser()
     parser.add_argument("--source", dest="source", nargs="+", required=True)
     parser.add_argument("--collection_id", dest="collection_id", help="Unique id for collection", required=False)
-    parser.add_argument("--title", dest="title", help="collection title", required=True)
-    parser.add_argument("--description", dest="description", help="collection description", required=True)
     parser.add_argument(
         "--start_datetime", dest="start_datetime", help="start datetime in format YYYY-MM-DD", type=valid_date, required=True
     )
     parser.add_argument(
         "--end_datetime", dest="end_datetime", help="end datetime in format YYYY-MM-DD", type=valid_date, required=True
     )
+    parser.add_argument("--title", dest="title", help="collection title", required=True)
+    parser.add_argument("--description", dest="description", help="collection description", required=True)
 
     arguments = parser.parse_args()
 
     source = format_source(arguments.source)
+    title = arguments.title
+    description = arguments.description
+    collection_id = arguments.collection_id
+    start_datetime = format_date(arguments.start_datetime)
+    end_datetime = format_date(arguments.end_datetime)
 
     if arguments.collection_id:
-        collection = ImageryCollection(title=arguments.title, description=arguments.description, collection_id=arguments.ulid)
+        collection = ImageryCollection(title=title, description=description, collection_id=collection_id)
     else:
-        collection = ImageryCollection(title=arguments.title, description=arguments.description)
+        collection = ImageryCollection(title=title, description=description)
 
     for file in source:
         if not is_tiff(file):
             get_log().trace("file_not_tiff_skipped", file=file)
             continue
         gdalinfo_result = gdal_info(file)
-        item = create_item(
-            file,
-            format_date(arguments.start_datetime),
-            format_date(arguments.end_datetime),
-            arguments.collection_id,
-            gdalinfo_result,
-        )
+        item = create_item(file, start_datetime, end_datetime, collection_id, gdalinfo_result)
         tmp_file_path = os.path.join("/tmp/", f"{item.stac['id']}.json")
         write(tmp_file_path, json.dumps(item.stac).encode("utf-8"))
-        get_log().info("imagery_stac_item_created", file=file)
+        get_log().info("stac item written to tmp", location=tmp_file_path)
 
-        collection.add_item(item)
+        collection.add_item(item.stac)
 
         tmp_file_path = os.path.join("/tmp/", "collection.json")
         write(tmp_file_path, json.dumps(collection.stac).encode("utf-8"))
@@ -78,6 +77,7 @@ def create_item(
     item.update_spatial(geometry, bbox)
     item.add_collection(collection_id)
 
+    get_log().info("imagery stac item created", file=file)
     return item
 
 
diff --git a/scripts/files/fs_s3.py b/scripts/files/fs_s3.py
index 47dff2ead..b6ed71107 100644
--- a/scripts/files/fs_s3.py
+++ b/scripts/files/fs_s3.py
@@ -65,3 +65,13 @@ def read(path: str, needs_credentials: bool = False) -> bytes:
 
     get_log().debug("read_s3_success", path=path, duration=time_in_ms() - start_time)
     return file
+
+
+def bucket_name_from_path(path: str) -> str:
+    path_parts = path.replace("s3://", "").split("/")
+    return path_parts.pop(0)
+
+
+def prefix_from_path(path: str) -> str:
+    bucket_name = bucket_name_from_path(path)
+    return path.replace(f"s3://{bucket_name}/", "")
diff --git a/scripts/stac/imagery/collection.py b/scripts/stac/imagery/collection.py
index 36d05b3d1..405ce24b1 100644
--- a/scripts/stac/imagery/collection.py
+++ b/scripts/stac/imagery/collection.py
@@ -1,13 +1,10 @@
 from datetime import datetime
-from typing import TYPE_CHECKING, Any, Dict, List, Optional
+from typing import Any, Dict, List, Optional
 
 import ulid
 
 from scripts.stac.util.STAC_VERSION import STAC_VERSION
 
-if TYPE_CHECKING:
-    from scripts.stac.imagery.item import ImageryItem
-
 
 class ImageryCollection:
     stac: Dict[str, Any]
@@ -26,12 +23,13 @@ def __init__(self, title: str, description: str, collection_id: Optional[str] =
             "links": [{"rel": "self", "href": "./collection.json", "type": "application/json"}],
         }
 
-    def add_item(self, item: "ImageryItem") -> None:
-        item_self_link = next((feat for feat in item.stac["links"] if feat["rel"] == "self"), None)
+    def add_item(self, item: Dict[Any, Any]) -> None:
+
+        item_self_link = next((feat for feat in item["links"] if feat["rel"] == "self"), None)
         if item_self_link:
             self.add_link(href=item_self_link["href"])
-            self.update_temporal_extent(item.stac["properties"]["start_datetime"], item.stac["properties"]["end_datetime"])
-            self.update_spatial_extent(item.stac["bbox"])
+            self.update_temporal_extent(item["properties"]["start_datetime"], item["properties"]["end_datetime"])
+            self.update_spatial_extent(item["bbox"])
 
     def add_link(self, href: str, rel: str = "item", file_type: str = "application/json") -> None:
         self.stac["links"].append({"rel": rel, "href": href, "type": file_type})
diff --git a/scripts/stac/tests/collection_test.py b/scripts/stac/tests/collection_test.py
index 67e1b0280..8ea0e225a 100644
--- a/scripts/stac/tests/collection_test.py
+++ b/scripts/stac/tests/collection_test.py
@@ -65,7 +65,7 @@ def test_add_item(mocker) -> None:  # type: ignore
     end_datetime = "2021-01-27 00:00:00Z"
     item.update_spatial(geometry, bbox)
     item.update_datetime(start_datetime, end_datetime)
-    collection.add_item(item)
+    collection.add_item(item.stac)
 
     assert {"rel": "item", "href": f"./{id_}.json", "type": "application/json"} in collection.stac["links"]
     assert collection.stac["extent"]["temporal"]["interval"] == [[start_datetime, end_datetime]]
diff --git a/scripts/standardise_validate.py b/scripts/standardise_validate.py
index 4a911b823..7029b267a 100644
--- a/scripts/standardise_validate.py
+++ b/scripts/standardise_validate.py
@@ -31,6 +31,9 @@ def main() -> None:
     arguments = parser.parse_args()
 
     source = format_source(arguments.source)
+    start_datetime = format_date(arguments.start_datetime)
+    end_datetime = format_date(arguments.end_datetime)
+    collection_id = arguments.collection_id
 
     if is_argo():
         concurrency = 4
@@ -47,16 +50,11 @@ def main() -> None:
             continue
         gdalinfo_result = gdal_info(file)
         qa_file(file, srs, gdalinfo_result)
-        item = create_item(
-            file,
-            format_date(arguments.start_datetime),
-            format_date(arguments.end_datetime),
-            arguments.collection_id,
-            gdalinfo_result,
-        )
+        item = create_item(file, start_datetime, end_datetime, collection_id, gdalinfo_result)
+
         tmp_file_path = os.path.join("/tmp/", f"{item.stac['id']}.json")
         write(tmp_file_path, json.dumps(item.stac).encode("utf-8"))
-        get_log().info("imagery_stac_item_created", file=file)
+        get_log().info("stac item written to tmp", location=tmp_file_path)
 
 
 if __name__ == "__main__":