There’s three pairs in the Speke and Hale area.
All three nest in barns and are looked after by very protective farmers.
Most years they fledge chicks, but the chicks have to leave the area, as there isn’t enough room to sustain another pair - food / territory.
The three pairs in Speke / Hale have been there for decades, but that’s it, it will always remain as three pairs.
My mate lives in East York’s and they’re almost common there, as there was a big push on nest boxes a while back.
Habitat loss, loss of nest sites ( barn conversions ) climate change ( wetter ) and getting killed on the road are what’s doing them in.