I would throw a Westone Thunder 1A into the ring. If my back weren't so fragile, anyway Great value, if rather heavy, instruments that sound immense. £200 would get you one in good nick and some change, too.
If you had just £50 more there is a bitsa Fender Hot Rod for sale in the classifieds here that is exceptionally nice. Then again, for £220 there is a Yamaha 214.