Of the 3 extra 200s I can think of 1 is at Cambridge aero club, 1 is at Bourne (Adrian Willis), which is also near Cambridge and the other is Tom Casells and he is even further north somewhere so none will be a of much use to you.
Wont take you long to get used to the cap, it doesn't sit nearly as nose high as a chippy so easy on the ground and to land. it will just be a lot more responsive than a 152 and you'll need far less stick pressure to do anything. Tiger club are a relaxed bunch, you don't pay extra for instructors so no financial penalty for taking your time and flying with an instructor as often as you want, even after aopa and once you've done the hours you can probably enter dick bently in the beginners category.
having said that, if I had the time instead of loads of kids I'd be after that share in the 300L. (works out cheaper than renting the 200!)