Another Update
done around 1000 miles in it now, finally got round to doing an ECU reset, my god the thing has woken up! Before it lacked a bit of bottom end pull but now even a touch on the throttle and its just instant. A merc E350 estate thought he would try and make me look stupid down my local bypass,saw him in his rear view mirror laughing at me, nah mate, weren't having that. Stuck with him all the way no problem and he was going for it hard. Its definitely had its limiter removed so it needs a definite dyno test to see what its doing. I'm convinced its not standard now.