Kluge,
if you can get back to that particular Scout ... open the rear port door and lift up the padded back-rest on that side (which is probably not there, as it's been stripped, but you get the idea ...) and there _should_ be a little plate with an 'F8/nnnn' number on it. If you can let me know that number then I might be able to help to pin it down to an exact airframe.
That number is the 'pod-number'. All the Westland Scouts and Wasps were made up from various parts, and each part had a distinct number. These numbers are not the same as the manufacturers 'construction number', which (as far as I can tell) there is no plate on a Scout or Wasp to help.
XV121 from the original query should have a pod-number of 'F8/6043' on that plate (does it?). According to all the records that I have ever seen, XV121 should have a manufacturers construction-number of F.9696. Is there a plate on XV121 with that stamped on it?
[/sad mode - off]!