I have to pretty much agree to disagree

. I definitively had a different experience. I've gladly paid £30 fee for a single point installation with no complications. It was done fast and up-to-standards, so I'm not complaining. However, I still think that an extra socket would not be a huge deal.
My first ISP here in the UK was Origin Broadband (£25 for 67 Mbps Down / 17 Up + £1.49 for an IPv4 if you are unlucky enough to live in a CGNAT area). They did accommodate my Flat's multi-socket situation. Openreach initially pulled a cable to the main Socket - they took forever BTW. ISP then send staff to install "BT" sockets at 3 different rooms. I don't remember the exact price for the service, however it was not £200 like some people have reported that BT itself is charging. I was never in a situation were an ISP refused to install a second socket before, and I really can't understand why they would refuse to do it given that they have the staff, equipment and expertise to do the job (of course that charging a fee is acceptable and expected).