T-Cut - the VVC manifold doesn't use an elastomer seal, it's a more traditional flat paper type affair.
The cold running problem did start at the same time the VVC manifold was fitted, but then the ported cylinder head also went on that day too, so can't point the finger definitively anywhere. The starting is a more recent development, at first very intermittent but gradually becoming more regular. I have noticed that unless I wait for the fuel pump to time out, there's absolutely no chance of the car starting; it'll just crank and crank. Not sure if that's normal or not?
genpk - a good suggestion, but the O2 sensor has already been changed twice - once for aftermarket, and once for OEM - no difference.
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