PS I just googled "RAF training exercise crash montrose scotland 1941" and there are several sites to look at.
Quick glance there is an article from 24th August 2019 from a local Aberdeen newspaper "A museum is seeking help from north-east residents in a bid to piece together the history of a downed Nazi plane on north-east soil.

The RAF Montrose Air Station Heritage Centre has recently been donated a radio controlled model of a German Ju88 bomber from the Second World War."

I haven't read the article but on using google, again a quick glance seemingly indicates the Museum is
on the site of the Montrose air field. Seems as though that would be a very good place to investigate. Jill