See if you can get a refund and buy one here. I would think £400 is going to be close to driving there.
Euro tunnel/ferry plus at least one motel, probably 2, and a 1500 mile round trip (from London)
Could always pick up some pellets from JSB while you are over there. Probably 1/2 the price of here.
BFTA/NSRA County Coach
CSFTA Chairman/BFTA Rep