Thanks for your helpful responses guys. I am glad I am not the only one having problems with this.
The Winterburn sounds interesting - incidentally Bryn it is the son of the original inventor who is now taking this forward. I guess it has the advantage of a bigger spark that electronic ignition gives with the ease of retaining the points but making them longer lasting. However they are pretty expensive at about £160 which with VAT and postage would be near £200. I have seen other, presumably similar systems for sale - i.e. those that retain the points as a switching mechanism with a separate box of tricks outside the distributor - for far less but I wonder if you get what you pay for?
Re the Pertronix system, I have tried altering the timing as suggested but I have still not been able to get the thing to run properly and I have spent many hours on this. It may run fine on tickover but as soon as you open the throttle it bangs and pops and misfires terribly. Do you know what the setting should be?
Also I have the issue of the non firing HT lead. The Distributor Doctor, who I bought the Pertronix from, is sending me a new cam ring - the bit with the magnets on - to see if that will solve the problem. I will report back when I have tried it.
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