Swallow or housemartin?

Ok, back to birds.

Now I thought these were swallows swooping around the houses....the day before yesterday there were definitely swallows with their streamers.

But.....I think this may just be a housemartin (which would mean we have both types locally)

Anyhow....whatever it is I'm really please I managed to get this pic...the bird was high up so its cropped to allow you to see the detail. And thats not a cut n shut wing...its the sun (yes sun) glinting on the feathers :)