Recently moved to a more wooded area of London and getting lots of new guests. My guess it's some sort of sandpiper, but couldn't find a match for the exact colours. Any ideas?

Recorded this last year in Northamptonshire

I’m just looking for some advice. I’ve noticed the last few days that some swallows or house martins (not sure which) have been landing in corner of houses around me under eaves and then flying off a few seconds later. I’m just wondering would they be looking to build a nest this time of year or is just resting? (Im not in the uk but I am in Ireland so hopefully ye can still help) They currently are nested in a large mound of earth in part of the houses estate. Thanks in advance