My swifts turned up weeks ago, or at least I think it's swifts again (heard them, but not seen them). Certainly appear to be down in numbers compared to previous years. Spotted 1 smashed egg on ground 4 storeys below, so they must have laid.
Last year was a double occupation. Swifts and House Sparrows, with one turfing the other out, although I think they'd pretty much fledged by then.