I actually should have questioned this, but it didn't occur to me till hours later!! Was at the vets earlier, and I had to use the other branch, and they had a poster up saying this (words might not be exact now!!).
It is policy to scan all new pets (can't remember if it was new clients only or not) for a microchip upon registration. If you refuse, then we can refuse to accept you as a client, and the pet as a patient.
There was a bit more to it, but that is the general gist. I am glad they are scanning as standard now, hopefully if someone adopts a 'stray' and takes it for checkup etc, it should be scanned and if a lost pet with a chip, hopefully can be reunited. The thing I will question on Thurs (if I remember) is what will they do if people do refuse?