You get a free trial, which after 2 weeks auto renews at £16.95 per month.
But when you go to their website you can actually have a FULL YEAR for £16.95. However, here's the stinger, if you've taken the free trial (like I assume most people do) then you automatically renew at £16.95 per MONTH and CAN NOT have a full year for £16.95.
I went on live chat and cancelled as I didn't want to pay 12 times more than necessary, and it cancelled effective immediately, so didn't even give me the month I'd paid for! So I paid £16.95 for half a day.
Be very careful!