I learnt at BAFC at high wycombe and went in and out from central London on my scooter 1 or 2 times a week. 1st summer I went solo and then I stopped all lessons then until the following spring - as the weather seemed to conspire against any consistancy. The following summer I got my PPL and came through in about 50hrs.
By contrast, most of the folks who have trained in S/Africa or USA seem to come back from their crash course with part of the sylabus incomplete - Usually the navigation - and seem to need at least 10 hrs to adjust to the rather more restricted environment that is the UK.
Do it here, you'll enjoy it. Don't rush it either - unless you have a pressing need - it's part of the fun.
