Don't know any tuners in the south im afraid (family moved from St. Ives to Birmingham when i was still in nappies

) but a mobile custom-code does seem like the sensible option. More expensive than some but they have some of the best experience and technical backup around. I'd recommend a decent panel filter at the same time as the remap though.
With such low miles i'd imagine your shocks are still like new, so for a comfy ride a drop of 35-40mm on eibach springs will be fine.
As for brakes.. well I ran mine on OEM discs with uprated tarox pads, and i felt it was more than enough to handle the 200+ bhp the car was kicking out. If you don't want it to be a track toy, but rather just a quick daily driver, you should find a similar setup adequate.