The cost to enter a team is 7 pounds per participant. So just multiply by the number of members in the team!
Unfortunately we are still not process payments via our signup site (coming soon) When you submit a team via our signup page and it passes validation. Click make payment, on the dialogue box mark how much you have paid and one of us will validate the payment has been received. Once this is done your team will be marked as submitted and you are away.
There is more information on how to submit teams and pay on an older blog post here. If you have any suggestions to improve this process let us know.