In reply to Bongokong:
You give no indication of what's local to you, but assuming it's Dartmoor then: Dartmoor. Otherwise, the Peak is quite popular to get into bouldering.
Not sure there's such a thing as a 'beginners' mat'. Get the biggest, deepest mat that a) fits in your car and b) you can afford.
That said, something like the Ocun Paddy Dominator covers a lot of bases - it's deep and can be opened in two different orientations to cover different landing options. That said, if I was going for 'one pad to rule them all' I'd get something like a Moon Saturn. Once you get a meter off the ground you'll realise there's no such thing as 'too much pad'.