Wow. Great response - thanks everyone! And thanks for the invite Ruy.
I found the photo of the 109 that crashed in Woolwich a while ago in a book and showed it to dad. He said that it wasn't the one he saw crash at the entrance to Gibson's farm in Wickham Street - the one he saw didn't look badly damaged.
But it does sound like Friedmann was the pilot as dad told me he read in the local paper that the pilot that landed in the Gibson's farm crash was buried in Bexleyheath cemetery.
Dad was young when he saw the crash and is getting on a bit now but I know he is very observant so his recollection shouldn't be totally discounted.
He recalls that the plane was on fire when he first saw it falling and the fire had extinguished before it struck the ground. His friends started cheering when they first saw it and he told them to shutup as it could be one of 'ours'. (Typically thoughtful of dad
)
Anyway, I'll show him the picture again (and the profile - thanks Ruy).
I'll let you know his resonse.