I just came on to post a thread similar to this one to find that AllGone has beat me to it!
I am in a pretty similar situation, I was quite actively involved in MB'ing for a few years whilst I was at Uni, but I haven't really done anything at all over the last year or so since I have been working. I guess the fact that I was earning more from my work, combined with a declining £/hr in profit from MB'ing resulted in me drifting away from it.
I did always like the hobby aspect of it though and I guess that even though my earnings are terrible if categorised in £/hr, if you are making money from a hobby you are doing something right!
Now i'm looking to get myself back involved, I have a bankroll of around £2500 to help me on my way. I am limited at most of the bigger bookies so I guess that will hamper my initial progress. I'm going to set myself a modest target of reaching a bankroll of £3000 by christmas, hopefully that will be achievable.