diff --git a/docs/demos/Video_Processing.py b/docs/demos/Video_Processing.py
index 6d8e63b8e..31144aefb 100644
--- a/docs/demos/Video_Processing.py
+++ b/docs/demos/Video_Processing.py
@@ -469,12 +469,8 @@ def draw_detections(image, detections, show_class=False, show_score=False):
 prior_state = GaussianState(StateVector(np.zeros((6,1))),
                             CovarianceMatrix(np.diag([100**2, 30**2, 100**2, 30**2, 100**2, 100**2])))
 deleter_init = UpdateTimeStepsDeleter(time_steps_since_update=3)
-initiator = MultiMeasurementInitiator(prior_state=prior_state,
-                                      deleter=deleter_init,
-                                      data_associator=data_associator,
-                                      updater=updater,
-                                      measurement_model=measurement_model,
-                                      min_points=10)
+initiator = MultiMeasurementInitiator(prior_state, deleter_init, data_associator, updater,
+                                      measurement_model, min_points=10)
 
 # %%
 # Track Deletion
diff --git a/stonesoup/initiator/simple.py b/stonesoup/initiator/simple.py
index 88bb9945a..15d1a1020 100644
--- a/stonesoup/initiator/simple.py
+++ b/stonesoup/initiator/simple.py
@@ -7,7 +7,6 @@
 from ..deleter import Deleter
 from ..models.base import LinearModel, ReversibleModel
 from ..models.measurement import MeasurementModel
-from ..types.array import StateVector, CovarianceMatrix
 from ..types.hypothesis import SingleHypothesis
 from ..types.numeric import Probability
 from ..types.particle import Particle