You will find it very difficult to work 30 hours a week and get a decent degree. I did the same switch - OU to Brick - and was only working 20 hours a week but it definitely compromised my degree, and a First was out of reach. Be prepared for your 'student experience' not being the same as everyone else's. You will not be able to attend 'extra' stuff on campus because of work/sleep/travel logistics and will often feel frustrated by this. And you will be surrounded by 18 year olds. Its do-able, but you will feel permanently knackered,