A number of DG obituaries and elsewhere (all possibly referencing the same source, this Pete Frame tree) state that Davy was an occasional member of the earliest lineup of John Mayall's Bluesbreakers, alternating with another guitarist, Sammy Prosser, whose name unfortunately means nothing to me (we are talking Jan-March 1963 here, in London). Can any catters with long enough memories shed any more light on this this maybe??