Finally got around to taking my car to the guys in Bristol who advertise on eBay after my gearbox started playing silly buggers. Had a code saying input speed sensor faulty so pointed to a faulty gearbox ecu, they removed and tested my ecu to find it was in fact fine, it was a circlip holding a shaft within the gearbox that had either broken off, or was never there, it allowed a spinning sensor to move off scale causing the fault. They replaced the sensor and circlip and it's perfect once more, they reset the adaptations and my car has never been smoother. They really know their stuff and if I ever have any gearbox issues I wouldn't take it anywhere else.
so happy to have my car back operating as it should, having spent out £1k on servicing, tax, and fixing this issue she will have to stay for at least another year.