Well I bought a HighFlow fuel pump and fitted it today. All good so far, though 2 things to note:
1. the supplied connector tube from the pump to the fuel filter is too big at the filter end. Had to insert a sleeve to get a good seal.
2. Lots of grey watery fluid came out of the fuel filter. Is this normal? I would have though that this should be periodically replaced but it is not on any of the service schedules.