In addition to the problems raised by other commenters, there is a huge problem for ISPs that rent space in BT's switching centres: BT wholesale will only allo

In addition to the problems raised by other commenters, there is a huge problem for ISPs that rent space in BT's switching centres: BT wholesale will only allow approved parties to enter their premises. AFAIK only BT retail and Alcatel are on the list of approve maintainers. So third-party ISPs are forced to pay extortionate fees to Alcatel who get to make more on-site vists (and charge more) if they make more mistakes.