I'm growing some Bhut Jolokia's (world hottest pepper aka ghost pepper) amongst other hot peppers. Anyone have any recommendations what I can do with them? I picked one off the plant last night. I'm looking for something other that hot sauce or chili. 
Depending on exactly the recipe you are using it in, I'd either go for a meaty white fish such as Cod, haddock, or the cheaper fish like pollock.  You may also be able to get away with something like mackerel, which isn't as white and chunky but is much cheaper.  You should be able to get all of these in a UK supermarket.  You could also try a fishmonger (either in the Supermarket or independent) - ask them what you could use instead.  