I replaced the 20nF SMT cap that had been soldered onto my display board with a 10 nF leaded, micro-ceramic type (I coluldn't get SMT in my neck of the woods ). Despite great variation in local temperatures over the last few weeks it's been installed, there has been absolutely no repetitions of the dimmer problem (it used to happen about 3-4 times per month). So it looks as if (in my case, anyway) it was in fact just a matter of the wrong value cap.
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One of the few remaining Mk1 owners... #00015
). Despite great variation in local temperatures over the last few weeks it's been installed, there has been absolutely no repetitions of the dimmer problem (it used to happen about 3-4 times per month). So it looks as if (in my case, anyway) it was in fact just a matter of the wrong value cap. 
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