Rolling road + ecu set up in Scotland

[peterzoom]

I had my XJ8 set up at Paramount a couple of years ago, its been a fantastic improvement and I have been very, very happy with it.
However, over the last few weeks I have noticed a definite flat spot on full throttle, low rev pick up, as if there is a `hole` developing in the programme.
I had new plugs and a fresh K&N as part of the service in October and all has been fine until the last couple of weeks. There are no other symptoms and I am guessing that a visit to a rolling road and some tweaks to the ecu should rectify any issues.
Any thoughts or even better any pointers to skilled rolling road and ecu guru`s in Scotland?

[GreigM]

sounds like your O2/Lamda/MAF sensor may be on the way out as the map shouldn't need changing if it was working fine and you've fundamentally not changed anything....should only need remapped after mods, shouldn't need "maintenance" mapping..