First thanks to Albert for a (very promptly made) beautiful set of headers for my XB12SCG, and thanks to BlackBear who fitted them whilst renewing a broken stud on the front head (that's why I bottled out of doing it). Bike was turned round in a week including sending it from North Yorks and then back again. Top class service from both.
Also a bit of advice if possible - with the headers, a Free Spirits non-cat exhaust and K&N, I've put on a Remus Powerizer (I know that people seem to either love or hate these) but it's too early to tell yet how it is running as the weather is stopping me getting some miles on right now. Question is, is the Poweriser necessary, would the bike be ok with the above mods and no Powerizer, or is there a better alternative? It's not really practical for me to mess about with the ECM as I only have access to Macs, not PC's.