Tbh a quick Google search will bring up a fair few companies around that can deal with aftermarket ECUs, like Jamie said, a remap is just a remap after all. Personally, I would consider it to be easily worth a day a on the road to end up with a quality map though. After all it's not just peak figures, it can affect the whole drivability and long-term reliability of the car too so I would rather take it to someone with some specific previous experience. That's just my 2p though, it's just what each owner prefers. There is definitely mixed feedback out there for almost every firm, hence why I'd recommend reading about before making your choice. I've read only good things on here about Will @ RDT recently so if it were mine, that'd be my choice. You certainly have no shortage of options nationwide though and I'm sure you could find someone competent who is less of a distance away