Sand martin and swallows at Walmsley

I grabbed a couple of shots from the tower hide at Walmsley of a sand martin and some swallows that looked rather odd. One has a lot of white in its feathers, the second has a deformed beak and the third appears to be a possible martin/swallow hybrid if such a thing is possible. It was a fair distance away so the quality isn't too good!

Sand martin

Swallow

 

 

Swallow with deformed beak

Possible Martin/ swallow hybrid?