Welcome bevanid ... You are very lucky to own a Chipmunk ... Well done for keeping one of the old girls flying
WP861 seen here at Abingdon.
I'll see what information I have ... But your best bet might be to see if the RAF Museum could help you with info from this aircrafts Movement Card ...
I take it you know that the Duke of Edinburgh (as MRAF) did his basic flying training on, then, a brand new Chipmunk WP861 at White Waltham but he did his 1st solo in WP912 20/12/1952 ...
RAF Museum Research
Could you post some current pics please ?
Best ...
Coff.