you need to take the car somewhere decent rather than drive it on a mapp that isnt right for the car

getting a mapp off someone should really be for just getting it running and checking it all over and making sure it all works before taking it for mapping

gordon at street racers would be a good bet
and also if someone could supply you with chris tods number, very experienced with omex (he might do it as a side job to his work)
northampton motorsport have some good reviews, but as you do before picking a tuner always make sure you do your research on the company beforehand as any bad reviews will be on the net, and ring them up and see what you think of them on the phone
could always contact MA developments and see if he would be interested in doing it.

but someone who does omex that i personally rate and have experience with is norris motor sport NMS and they would do a fab job with the car