Re: Hardcoded root?!
With the sole exception of Sky, no UK ISP actively prevents you from using your own router.
Sorry, I should have been clearer: I don't class 80 Mbps as high speed broadband, and was referring to the primarily cable and (real) fibre networks, which is primarily, but not solely Virgin Media
Not really sure what Ofcom or the EU have to do with this
EU rules require that ISPs allow customers a choice of "terminal equipment", Ofcom are (laughably) the enforcer of relevant EU regulations. You get that choice with most Openreach ISPs, not with most non-Openreach networks - again Vermin Media are the prime suspects. Ofcom had a timid look at these rules in the middle of last year, and then backed off without saying or doing anything.