Kestrels behaving strangely

Walked down to the gate at the end of college road. Not alot happening, but then I spotted a couple of Kestrels coasting along the hedge line on the updraft where the wind hit the hedge. They then proceeded to chase stuff down on the ground. They may have been chasing crane flies, I think I have read/seen something which describes that behaviour.

Farmoor reservoir

I have never been to Farmoor. Used TomTom to get Helen and I there, asked at the gate about a hide key but £13 seemed a bit steep, (10 membership and 3 for the key). The Warden suggested that there was plenty to see anyhow. Walked along the causeway saw some small birds (warblers and tits around the nature reserve on the far side). Walking back round the non-sailing side came across sandpipers. Various wagtails, long tailed tits, garganey, and 7 common sandpipers.