JXC is right. NEVER pay ANY money up front for flight training, and be very suspicious of anyone who asks you to do so, no matter how big a 'discount' you are being offered. Pay for each lesson as you go.
The 'minimum' with regard to hours to gain a Microlight Licence is just that, but I believe the average in the UK is 35-40.
As for the flying itself, I strongly suggest that you have introductory flying lessons with at least 3 different schools in your area, and then you will have a good idea what it's like, and which school suits you best.
Have a great time.
MJ
