The residence association have no right to claim this fee for something that isn't theres. The infrastructure for any differently funded roll out of FTTP such as FoD or CFP is still owned by OR, and no one else has any legal right to charge you for accessing the FTTP network bar OR.
Whats most likely happened as previously mentioned is your Residents Assoc is trying to recoup costs of an FTTPod or CFP project that included your house on the plans, but the previous occupiers didn't want to fund. Regardless, if the DP that serves you is FTTP enabled with a CBT you will be able to order a FTTP service with no strings (As in from the residents assoc).
Sounds like they're salty that the previous owner didn't want to pay up and are now trying to get some cash back. Don't pay it!
Edit: Agree with Dect, sounds like neighbours trying to mooch some monies off you!
Edited by Whitehall11 (Thu 28-Jan-21 22:20:23)