Many = All
But also I believe there was more to that than that quote you used.
Section 8 has a lot of contract changes listed. Especially examples.
I have no qualms about people not paying a fee if prices change, but there is instances with court proceedings that have gone against a company that have done this mid contract in favour of the customer.
But I think the main thing that annoys most people is VM's control of the contract, if you get sub par service and choose to leave you have to pay a fee, which is wrong, since Sales of Goods Act also covers services provided by a business.. and the contract even though worded in a way to protect VM, cannot over power law, and thusly a sub par service for a long time would annul the contract... but yet VM try to get fees for it.
But anything else that would require them to foot a cost, technically I am legally entitled to say to VM if you change the contract I can charge you a £25 fee for doing so, to set up my new direct debit etc... but yet they would rather you just kill the contract and dump services than go through that, which makes them a hypocrite of sorts.
So yeah... the contract is unfair imho and in favour mostly to the provider being VM.