When do your swifts first arrive by you?

I put up some swift boxes last summer and am very much hoping some will come and make their forever nests here this year. Once they choose a site they return to it each year. I am told that playing swift calls (on a loop on Youtube) will encourage them to swoop down to investigate. I plan to hang a speaker from my bedroom window. When do you first sight yours? I am told the last week of April is usual for the UK.
Thanks
1
Posts
this is interesting too - just came across it https://eurobirdportal.org/ebp/en/#home/HIRRUS/r52weeks/CUCCAN/r52weeks/
Can’t wait to see them, and hear a cuckoo too!