Garage in the Swansea/South Wales area?

Does anyone know of a good independent garage specialising in electronics in the Swansea/South Wales area, as I have an electrical issue with my Skoda Superb Mk3 and the main dealer doesn't have any appointments for over a month?

I have a problem with the doors locking/not locking; also, the windows do not work that well - they’re jerky and sometimes unresponsive - and the engine management light is permanently on. The doors have been an intermittent issue ever since I purchased the vehicle, but most garages don’t seem to be able to resolve it.

Thanks,

Andrew