We have (at least) 2 birds nesting. A robin has decided to build a nest in a nest-box (see above) I installed last year. There is also activity in our loft, which may be a blackbird's nest. I suspect there are also nests in our hedges. We see lots of blackbirds and robins.
UPDATE 1900z: Although there are swifts and cuckoos about near here, I have not managed to see any in April.