Well i took it to "Exhausts UK" as recommended by 'ICEYPOLO', based in Sheffield and they did an excellent job! They didnt mention any problems with the lamda situation...Although it needs extending to fit on the Raceland.
I was going to get it De-catted and a stealth custom exhaust also on the day...but im moving out in a couple of months so i had to change my plans
So far the car feels a lot better, it doesnt sound loud at all (which is good IMO) Will feel better once i have enough to do the exhaust and CAT