Hi, I fixed the problem - I hadn't realised that the L297/L298 board had a current adjustment on it - donhhhh! It must have been just below a critical value as this morning neither motor would run on that driver and it only took a little tweak to get it to drive the motors at full power. It does have the unfortunate problem of making the motor 'sing' quite loudly when its at rest but I guess I'll have to live with that until I can change the driver for something a bit better.....
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