I'm currently learning with Staverton Flying School, based out of Gloucester.
They have two 152's and at least one 172 (might be two i can't recall as I fly the 152).
Great school, aircraft in very good nick (ex RAF techie so I know what I'm looking at) and a broad spread of instructors including ladies, so one of them will match your character and learning style I'm sure.
Staverton Flying School | Explore the skies
They have recently started an online booking system, so you can easily check their flying calendar, and book a lesson in a vacant slot.
£170 an hour for instruction, including one landing. Very good pre / post -flight briefings with no extra cost no matter how long things take. My usual visit takes over two hours, yet I get charged the single hourly 'flying' rate for each lesson.
Give Nessa a ring for more details - 01452 712388