Flying schools near you are located at the following airfields:
Damyns Hall
Medway
Stapleford
Biggin Hill
Redhill
Southend
Manston
Headcorn
Lydd
Rochester
(apologies to those I've undoubtedly missed out)
If you've never been to a flying school/club before, try not to be put off by the facilities. Most PPL schools are housed in rickety old cabins and often the aircraft are 30+ years old with a paint job from the days when yellow and brown were de rigueur. All the schools at the above airfields are fully licensed by the Civil Aviation Authority and conform to very strict standards, so while the 'look' might be a bit shabby (instructors included), you can rest assure that high levels of safety prevail.
Have fun!