I did my PPL at Elstree, but haven't been there for a while.
Firecrest Aviation were talking about picking up a 152 aerobat at the time but I don't know if they followed through with this.
The problem with Elstree is all the surrounding controlled airspace and altitude limits and a big part of any sortie will be getting out to somewhere where you cam climb above 3,000ft, etc. without busting airspace. I would also suggest the 152 aerobat is not the most capable plane.
If you're looking for a course I would think Kemble or my pesonal reccomendation, APS Training (if you fancy going a bit further), would be very good places. They are both staffed by ex military fast jet pilots and I think you would be hard pushed to find better. Aircraft are the Extra 300 or I think Kemble has a Bulldog too.
Other than that, as suggested maybe get in touch with Alan Cassidy at WW.