Oi!
Bristol has a great music scene(everything from metal->ska->pop->DnB), a nice free museum, good shopping and is cheap. Few natural beauty spots (eg clifton suspension bridge), and lots of history to explore too.
Or hit Falmouth for a quieter holiday, it's very pretty and there are cool boat tours, but they're better when it's warm!
Considering the coach to London Thursday morning then traveling back Saturday afternoon. Around £50 for travel then £160 for accom. Leaves us £290 for 2 days survival.