Daytime help line (Doncaster) was great. No stupid list of idiot things to do. Tested line, very slow, engineer arranged for next day, arrived early, fixed 3 potential problems, including new master socket. Wireless fibre broadband speed went from 4 mbps to 40+ mbps.
Very pleased but this problem had been there for a long time and should have been fixed when infinity was installed. Indian chat help online was next to useless.