No high level flights or screaming from 7.30pm to 9.00pm at all. No big numbers. In truth none expected after 8.20pm. From 8.02pm to 8.50pm, 7 or 8 swifts at rooftop level, mostly silent. I interpret this as 2,3 or possibly 4 nests still being attended. This is concomitant with the rubbish weather in June and July and the possibility this glorious week may allow some late success. Just my take on things.