You don't have to get time off work to learn to fly. Will just take an awful long time to do. I've been doing mine since this time last year and I'm 23hrs in. Personally, I prefer the fact that it's taken me this long, I get to fly most weekends sat & sun (I paid up front tho), once I have my license it'll go to perhaps once or twice a month.
I'd recommend you look for a proper flight school rather than a club, as they tend to have better availability of aircraft, and instructors. Last thing you want is to be denied a lesson during the weekend because someone else booked theirs 10 months in advance
That said however, the club environment is much friendlier, if that's your thing, just make sure you keep your diary well stocked with booked lessons.