Note the all black bill, complete absence of any green or yellow hues on mantle and head, buffy grey mantle, pale buff super and almost white underparts. There is a faint wing bar caused by the pale tips to the greater coverts. The cheeks are also pale buff which reduce the prominence of the eye-ring usually obvious on other races. The rather Bonellis Warbler like contrast between the mantle and the yellow-green colour on the wing and tail can be seen on two of the shots but is not as obvious on he third, although this is the same bird.
4 of the remaining birds appeared to be of the 'common' collybita race while a fifth appeared all grey and could not be assigned to race. Wintering Chiffchaffs are always worth a second look Observers E,W (photos) and K.D.