I'd go and study the Access to HE diploma, but if you want to go to a Russell Group Uni or Bath, Surrey etc then make sure you pick science and/or human biology - a vast amount of Russell Group unis is will want some science background. Furthermore, you'll also need to achieve at least 45 Level 3 credits and of those 45 level 3 credits you'll need at least 30 distinction or more to go to a Russell Group uni - the only exception is Exeter where they love mature students and would accept you with 21 distinctions. Check UCAS for other Access requirements or their website, but avoid University of Manchester for Psychology if you're looking at Russell Group Universities!
I applied to St Andrews, Bristol, Bath, Exeter and Warwick.