BSR are made by Jetex IIRC - might be able to find a Jetex one for less than a BSR one? Just a thought if anyone is looking for an 'OK' off the shelf solution
Other (better?) ones are Simons and Ferrita, but these tend to be more expensive
A few very good custom places around Yorkshire -
Custom Pipes, Doncaster -
http://www.custompipes.co.uk/ (I have used him many times myself, and every system has been spot on, and very well priced - eg 940 Turbo, turbo back stainless system incl 200 cell cat @ £350, albeit a few years ago; Landrover Discovery 4.0 full stainless system incl 2x cats £400, again a few years ago)
Tony Banks exhausts, Leeds -
https://www.tonybanks.co.uk/ (Great reputation and had many good reviews in various forums)