Only just spotted citronaut's reply which was posted while I was on my hols.
Since the pre-heat plugs were replaced it's done another 4500 miles and been absolutely fine. It's been to Liverpool for end of Uni term and The Lad had it last weekend taking it to North Wales and back. Pulls like it always did and returns 40+ to gallon if driven with care.
As that's all been in summer months it has still to be tested on a sub zero start. First serious frost here is not usually before November.
Might of course be a combination of plugs and a change in cam/crank relationship as you suggest and which has sorted itself as the new belt beds in.
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