Do students really need three phone lines? If so, for what?
It's £21.15 inc VAT but only if you've got three phone lines so a headline figure of £18 (or £21.15) is somewhat misleading. More likely you've be paying £14.10 inc VAT so a shade over £1.15 p/m if you've got two phone lines.
If this money is genuinely (almost) all used to improve Britain's internet infrastructure then I'm not bothered about paying it - ideally the carriers/backbone provider should be paying for it but since they've apparantly failed to make adequate provision for it I'm prepared to pay that little bit extra to see other people benefit. However I'd like to see some form of clause inserted with the supply of the funds to these companies relating to what they may charge people for providing services and/or changes to their lines etc so that may act as an incentive for them to make provisions for future events or face strictures for having to come cap in hand.