The second camera is now in situ. Of necessity due to cramped attic round a chimney the camera is too close so a little out of focus.

This is a picture from it that shows 2 eggs in nest.

A very short clip from the bedroom nest also showing 2 eggs.

I think its 2 eggs.The swifts are still out and about most of the day. Swifts do not sit on the eggs as much as other birds. Possibly because of the location in a warm loft space.