If you're happy to drive a little further, Bournemouth Flying Club have a Bulldog and Old Sarum (Salisbury) have a CAP10c. Both are available for hire, as well as aerobatic training and trial lessons - ability to hire is an important consideration when choosing a school. The Bulldog and CAP10 are excellent aerobatic training aircraft: side-by-side seating, reasonably powerful, good climb rates and easy to fly - important considerations when choosing an aircraft to train in.
As others have said, it's never too early or too late to learn. At the moment there's no requirement to complete a full course of aeros but many people choose to follow the AOPA basic syllabus so that there is a structure to their learning and a specific goal at the end - to pass the test! Having done that you will probably have grandfather rights when/if the requirement for an aerobatic rating is introduced. AOPA also have standard and intermediate syllabuses if you want to progress, or you can go à la carte.
Someone said that they weren't allowed to try aeros on a trial lesson - that's surprising. When I take someone on an aerobatic trial lesson I will offer to teach them how to fly basic wingovers, loops and ballistic rolls - if they handle these then it's usually possible to talk them through a barrel roll after a couple of demos. With an experienced aeros instructor and reasonable airspace you can do a heck of a lot in 30 minutes if you have an aircraft that performs well and is easy to fly.
HFD