May I point out the the AVO is still a respected and used instrument today.
Only five minutes ago, as I came into work, I passed the laboratory area here and there are AVO mk. 8s a plenty between the logic analysers and PCs.
Somewhere about I have a copy of 'Britain's Wonderful Air Force' a WW2 book which has some intriguing stuff: no Mosquito I think it's too early for that but a trainer 'in widespread service' called the Owlet - I could only a record of one of these being impressed into the RAF - which was said to have an unusual 'reverse-tricycle' undercarriage.
I will try to scan some pages if anyone cares!
VnV