Or you could buy one of these which is near Silverstone in Northamptonshire if you are going to all the effort of coming across, I'm sure if you spoke to them they would fit as well for the listed price and why not get CAT mod while you are are at it. http://www.clio182btbexhausts.co.uk/
I think the plan is to always have them in stock & not have to wait for X amount of people saying they want one. I'm very tempted to get 1 & the cat mod as they are only 8 miles or so from my house.
Of course this is a bonus over the Yozza as I think those as made in batches so not in stock.
Just out if interest, what makes a BTB worth £650 before fitting as opposed to a Janspeed for £350?
I thought there wasn't much power to be gained from an exhaust alone and a number of the other exhausts in the lower price bracket claim significant weight reductions too.
So why a BTB, Yozza etc? Is it because they are louder?