Fairly sure there are 2 maybe 3 firms (and several resellers).
It is as Cindy34 said, with generally high cost, low(ish) data limits, long contract and often a high (1K) setup cost.
No way (short of being a millionaire) that you could compare with landline (my 10 Mbps cheap ADSL from Plus.Net has been providing 300 GB of data a month - two households, plenty of iPlayer, ITV player, 4oD, TWiT.tv, etc and movies from NowTV or box sets (I caught up on 6 years of '24' over about 6 weekends!)
I would look more seriously at moving, before every home with poor broadband speeds is ignored by buyers. Rightmove and others are starting to put speed test information on, and many households, whether they have teens or younger, or someone near the top in their business, will want a rural retreat but one with fast broadband. I see the 'blighted homes' being those with few options and speeds below 5 Mbps in 2-3 years.
Sorry, just that one of my friends installs home audio/video (where every room has a a really big TV (50" plus, starting at £4000), streams video from their own server, with speakers and internet streamed music , etc. etc.
The people who pay for his services tend to pop a couple of million pounds into a remote farmhouse conversion so they have a lovely property with big grounds and within 40 miles of Manchester/ Liverpool etc, but then find well after everything is being worked on (new floors, etc, etc) that the internet lets them down. Have been to a few properties on the Cheshire Plains where there's abysmal internet speeds, and then complaints when clicking to start streaming takes about 10 seconds (from the satellite) as the customer has previously been using a phone line/ Virgin Media cable and the delay is maybe 1-3 seconds (so when it takes 10 seconds they are wondering 'is it working').