Well, after scouring the forum, convinced myself secondary cat removal was the way to go. Had the cats removed yesterday and the re-map done in one go. Did some research on re-maps here in the UK and happy that the LongLife offering was as good as the others (circa 20-24 HP gain). Turned out the guy who runs the LongLife franchise is a friend of my son, got a slight reduction and a very neat job! Problem is, I never gave the car a good thrashing before the mods, so I don't have a base line to compare against. Never the less, very pleased with the results and the slight increase in sound.
Fitter has quoted me for a replacement free-flow stainless back exhaust box, with OEM tips and options on how noisy I want it to be. I'll see how current set-up works and sounds and make a decision later.
Mick