Hi Brian
Just to let you know that an account concerning Ken Lee being shot down on this operation is in my book Five of the Few.
I am aware that there is a file AIR 23/6739 in the national archives which I believe concerns the operation - although I haven't actually had a look at it.
In addition - when I was researching my grandfather, arthur darlow's story for Lancaster Down - I managed to get in touch with Australian F/Lt Doug Hutchinson who roomed with him at StalagLuft III. Dough was a wireless operator with 454 Squadron on Baltimore's. Doug did send me an account of the his aircraft's demise, shot down on 23 July on an operation to Crete - but can I find it! I'll keep looking but just though I would let you know.
Hope this helps
Steve Darlow
www.stevedarlow.co.uk