I would be very surprised if you weren't welcome at any Uni as a 'mature student' and you would probably appreciate more what is on offer at Uni with experience of the 'outside world'. Assuming you were work oriented prior to going to Uni you would of course have some(presumably) saved money to see you through your academics.
For example many of those in the teaching profession leave school, go to Uni/Teacher Training and then back to school to teach. Personally I think that a compulsary sabatical before going back into school would make for a more rounded individual.
Why not contact the Registrar of your nearest Uni (it needn't necessarily be the one you would got to) and ask if you could come and have a chat. I am sure you will get good advice.