I know it's not nice to know you have made wildlife homeless, especially as we do so much to promote it seems via this site. I had my roof done over the winter and turfed out swift and sparrow nesting sites. They have all found alternative accomodation nearby as most of us in the terrace provide food, cover and a safe haven for wildlife. It's too good an environment for them to clear off totally, so as long as you do what you can to generally promote the local wildlife, I'm sure they will find somewhere nearby.