Hi Macflame,
Thank you for reaching out to us in our community and welcome back, sorry to hear your Phoneline isn't working after a power cut, I was able to locate you on our system with the details we have for you and was unable to see any issues, if we were to send a technician out and no issues found there would be a £25 callout charge, can you unplug everything from the phone socket including any extentios, alarms and filters and try a different phone.
You can find some further help and support here.
Regards
Paul.