Right, digging this one back out as I know people like updates.
Unfortunately I still haven't solved the running issue, but I have fixed the reluctant starting by replacing the fuel filter.
Decided to take the tank completely off while it was in the garage for the tank straps to be replaced, opened up the filter housing and boy was it choked up! I know the filters go black, but you shouldn't be able to scrape the gunge off them with your finger!!
That improved the running in general for a couple of days - it wasn't perfect but I figured it would settle as the fuel trims readjusted. Sadly that hasn't been the case and its gone back pretty much to how it was. It has crossed my mind that I may have a weak/failing fuel pump - perhaps the excessive black gunk is the insides wearing out (I know that's pretty much unheard of, but this car seems to love coming up with new, never before seen problems - like the auto 'box sump rusting through!).
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