There's no actual BD rating for bikes in the UK Joe, it only seems that the tester will think it's to loud and fail it, you might fall foul of the boys in blue if they have a BD meter with them or if it says "not for road use" on the can other than that you can pretty well fit what you like but the neighbours are going to burn you at the stake if you keep them or their rug rats awake.
He says it was good, and appeared to have a great time, but I dont want to steal his thunder
Well when this fella came off the ferry, I thought that must be ar kid