If you can establish that the fault is in the clocks then I think Scorpio Electronics would be able to help you. They have a few very happy customers in Norfolk and I've heard good reports on their work with instruments including an S4R set. Not sure if they get involved with ECUs though.
Scorpio Electronics in Lynn, 01553 279193 or 07768 624062,
35 Marsh Lane, King's Lynn. PE30 3AD.
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