MH883 was an LF Mk.IX and therefore from the above description should have the gun camera in the starboard wing. The LF Mk.IX was the version of the Mk.IX with the Merlin 66 engine, and as far as I know did not have an additional cooler in the starboard wing. The earlier version of the Mk.IX was the F Mk.IX, with the Merlin 61 or 63, which did have an intake in the port wing root for an oil cooler, which perhaps could be mistaken for a gun camera. However the initial F Mk.IXs did not have a gun camera at all – it has been suggested that this was one of the reasons why it was apparently so successful on its introduction. I don’t know when the gun camera was first fitted, possibly during the F Mk.IX’s production run, but it will not have been in the fairly large hole in the port wing.