If we draw a blank with Herbert, might be worth Peter posting a new thread on the Armed Forces board specifically looking for further information about Herbert? If, as Peter says, Herbert was a foundation member of the RAF, then there must be some record of him somewhere, and hunting him down may require specialist knowledge.
What do you think aghadowey?
(Of course Peter should provide a link to this thread so anyone who wishes to help can see what has been found so far and get a bit of background behind the reason for the search.)