Thanks. I would have loved to do the conversion myself for the satisfaction, but just couldn't justify the extra £ks.
I did alot of reading on here and used the manual method to read my error codes. They came back as 420 and 430 ie 'catalyst system'. Should be nothing serious I hope. I reset them. I have done 3 to 400 miles and they have come back 3 times, nearly always when at WOT.
I assume because of the SC and decats the sensors are getting too much flow. I haven't been able to check if there are the spacers fitted to the sensors yet, but will next time I'm under the car.
I would have loved to come to Japfest and say hello to a few members but I'm offshore at the moment.