Paul,
Not much luck, but I found the following on page 87 of the 38 Squadron Appendices (AIR 27 / 404) on a page dealing with airmen postings, etc. during June 1940.
"..8276 Sgt. WOp/AG Webb I. "
The Appendices only begin in May 1940 unfortunately. In the Form 541 part of the ORB for May 1940 he is recorded as an 'AC' but in June is transformed into a Sergeant though apparently carrying out the same duties within a crew.
Have not checked the AIR 78 files yet.
Hope this helps,
Martin Gleeson.
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