had to think about this...
last years i could choose from;
Yellow Browed warbler
blyths reed warbler
red breasted flycatcher
pied wheatear
Buff breasted, white rumped, pectorial and bairds sandpiper
and various regional rarities like phalaropes in Norfolk.
but the one that stood out head and shoulders (sorry that should be bill and wing) above them would be Great spotted cuckoo at Salthouse.
And the good thing about all these birds. They were mostly in Norfolk
Cheers David