You’re probably on a major ISP. Only the major ones in the UK are blocked and regulated. The smaller ones aren’t deemed as important.
It's difficult not to be on a major ISP when the minor ISPs can't contest on speed and value for money.
Now I'm on ~64mbit VDSL with no blocking at all on Zen. We pull 500G+ a month through it. Costs £37.49 a month.
They just rolled out 300mbit fibre as well so that's going in next month.
Speed isn't everything for me. I can QoS those problems away pretty well.
Try doing that today with 5 people all trying to watch Netflix. That wasn't a thing back in 2002.
In 2002, I had 1mbit.
Apart from their mobile offering - plenty of bad things to say about that!
They fix stuff quickly too, I'd recommend em.