Abingdon Sewage Works - Siberian Chiffchaffs

Two Siberian Chiffchaffs in the works/Peep-o-day Lane area this afternoon along with at least 6 Common Chiffchaffs. One bird could appear quite colourful in some lights and the other was browner and more contrasting with a whiter super. One gave a good, plaintive tristis call a bit like a Dunnock.
Photos below.

Photos (c) Ian Lewington