The outcome at least in the first stage was that I returned the fuel reg to standard spec, and got the gas tested again. That one substitution returned the cars fueling to 2.95CO%. Within spec, and the consumption is back to acceptable levels, (I'm again achieving about 300 miles to a tank with mixed driving.) As for the mis-fire, thats still there but due to a number of 'life related' obstacles, I've not been able to A/ replace the pump wiring to the 17amp spec wire as recommended by Tabetha, nor check the security of the contacts in the cps plug, loom side. I know this is what I have to check and change first, which is why an update hasn't been put up yet. I had nothing further to tell since the last piece of advice you gave. I have however purchased a quality soldering kit, and will be tackling removing the 3 large multiplugs from the loom (the bulk head mounted ones). Time constraints have meant that now I've stopped it eating fuel, and oil and filter changed it, I'm using it off boost happy that it's not gonna implode any time very soon. Fairly slack I know, but that's where I'm at.