Woodpecker amongst my favourite bird sounds. Also melodious blackbirds as the light begins to fade, woodpigeons cooing in the beech trees, a blackcap singing it's heart out in some hawthorn scrub, skylarks trilling away on Hampsfell, the first owl of the night from the woods....
Miss the Orkney greylag geese, curlews and lapwings though - can't have everything.