Wader ID Required

Again, very heavy crops, taken along the A640 within our recording area, it had a white rump in flight and flew off towards  Dean Head/Scammonden/ Ringstone

Possible Wood Sandpiper??

I felt I'd seen one before and if I'm correct I'd photographed one over at Thornwick Pool a couple of years back, cheers

EDIT -Phone call from DF, ID'ed as Green Sandpiper, thanks Dave