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it's down to poor servicing,the earth pins had probably gone(which have to be changed when servicing)thus allowing the insulation to probably be in the sump,so this is why you had the flame burning the back of the boiler
how can they be "gone" if the m series never had them in the first place?
i'm waiting for the first set of "earth pins" to corrode away to nothing and let the insulation sag again which is probably only a matter of time.