Interesting day. Warm and sunny this morning then cold northerly wind this afternoon. Early morning all 4 swifts had gone. About 10 am I stood outside as there were 2 swifts flying together. I think from my observations and reading from Facebook swift group that this sometimes happens when the second swift arrives. Shortly after this I saw one, maybe two, swifts entering what I think will be a third nest. I have a new camera looking at the spot they practiced getting to last year, will add a clip of this, but they are now 3 meters further down the wall. Will try to move the camera tomorrow. It will not be an easy job. Short clip from each nest and an empty space from the new camera.