I bought a copy of Where to Watch Birds in Somerset etc (1988 edition), from RSPB Saltholme, with what look like the above initials at the front…

He was birding locally during the 1990s & particularly noted Sabine’s Gull at dunster Beach on 31/10/96, Montagu’s Harrier in Shapwick area 14/5/97, White-winged Black Tern 24/10/95 & Penduline Tit 15/2/97 at Tealham or westhay