Many thanks for the information so far, seems perfect sense to have had a unit dedicated to bringing in the new type and its capabilities.
Any more tangible info about MOCU would be very welcome.
Another Nimrod grey area for me concerns the move of 236 OCU to Kinloss before returning to St Mawgan, and a temporary Nimrod MR.2 Conversion Unit set up late 1970s, early 1980s.