We still have young in the nest at Marbury House Farm & I often see them still feeding young when on holiday in September at a variety of sites around the UK, so not too unusual.

Hello, these later second or third broods can fledge in to early October

Surprised to see at least two nests still occupied by young and being visited by feeding parents.

Is it usual for House Martins to be this late?

I would assume this must be a second or even third brood for this season?