Anyway, with time at a premium I was pleased to see Martin Cade had tweeted that it was there just before I pulled up. There were about 6 people in the obs watching the garden. The barred warbler was there already, pecking away at the apples. It is a large warbler, almost reminiscent of a chaffinch. The colouration is overall quite grey, but on it's chest it has the eponymous barring.
The photos below hopefully give an impression of the bird. Apologies for the quality but they are on very high ISO and even then it was hard to get the speed up.
You can make out the scalloping on it's flank which in breeding adults turn into full bars. It certainly loves the apples!!!