The cheapest you will get here for high usage is BT I think (assuming you want unlimited).
No major LLU available so no real cheap bargains to have.
Sky isn't available. No TalkTalk. No o2. No virginmedia, no C&W. The LLU is what makes it cheap and you have none.
Whatever you get will be via BTs systems so more pricey. I'm assuming the area is fairly remote as you often only see no LLU in these kinds of areas.
I would say the best bet is to pay over 12 months and divide the cost between the 6 of you. So you pay 2 months each basically that way.
Short term contracts are unlikely to be unlimited.
EDIT: You would see around 7 - 8 Mbps speeds here.
Edited by ukhardy07 (Wed 29-May-13 13:31:56)