I'm just down the coast from you at Arundel and would recommend traveling up to 'R-Tech'. I know it's a bit of a drive but you won't be disappointed with the results.
I went earlier this month with my GTI , 283 bhp and 355ftlbs the result. The level of professionalism and knowledge Nikki and the guys showed up there and the recommendations from the forum made my decision to travel a bit farther fully justified.