We left box 3 with one adult rearing three youngsters, the partner having disappeared quite early on. Sadly this was too much for one bird to cope with and one of the young had obviously died whilst we were away. The other two seem to be doing well though, in fact we thought they probably would have already flown by the time we returned, but they are still here, with the single parent still caring for them.
Here they are yesterday afternoon while the parent is out feeding:
As far as we can tell, none of the other boxes have been visited by other swifts. We live in hope for next year!