The website clearly states that its a membership scheme and you'll be charged £19.95 per month if you don't cancel within the first 10 days. You have to read more than just the words in the big font. Giving away something valuable for free is only ever a way to get money out of you later on, so when you see these sort of offers you have to ask yourself how they're going to do that and you must read all the information they're giving you.