Derek Gunson & his bows - Yorkshire area?


Anyone know/knew Derek Gunson - former field champion circa '69-'7x,
in particular he was a bit of a bowyer making bows for himself & some others,
including Barbara Fielding who was ladies field champ in the same time frame
& i am led to believe shot a Derek Gunson bow.

What i'm looking for is more info & pictures of Derek Gunson & the bows he made.
I've now seen what i believe to be 3 of his bows & am aware of a 4th,
but wondering:
- how many did he make?
- was it purely a local/friend/club market?
- anyone got/had one? ..... & got any pictures to share?

Here are the ones i've seen (the 1st i've owned since 2010):