Paul, this is a world-wide forum with at least a few Brits. Most of the planes discussed in this thread are 3-channel trainers. It sounds like you already have a 3-channel airplane, so maybe you need a 4-channel trainer as your next one. You should do a search for that. Something like the E-Starter might suit you.

I don't know what is available in the UK, but you could start by checking your local hobby shop or domestic online retailer to see what they are offering, then come back here and do a search on the options to see if they are good or bad airplanes.

And I guess you could have something shipped from anywhere in the world if you had to.

Some of the more popular foam stunt planes are the Shock Flyers, which I think are coming out of Germany, so that is a bit closer for you than for those of us in the US.

Good luck!