Dryobates minor comminutus
Scarce, but seen at Goodwick (Mathew) and at Nevern, Langwm, Benton and Haverforewest (R.M.L.). Handbook (of British Birds - Witherby) says "a few may breed".
R.M.Lockley, G.C.S.Ingram, H.M.Salmon, 1949, The Birds of Pembrokeshire, The West Wales Field Society