Out checking the moth trap around 22:30 last night. I heard a wader calling as it was flying over in the dark. Sounded to be going >SE. It gave several interspersed quite loud calls interpreted at the time as Wi, wi, wit.......... Wi, wi, wi, wit........wi, wi, wi wit.....and gradually fading in the distance. I immediately thought - Godwit sp. - certainly not a Greenshank or Redshank.
Listening to recordings on xeno-canto later on, I suspect Bar-tailed rather than Black-tailed - but I will never be 100% sure !!!!