Thanks for the responses, some good information.
RED IS, I'll see if I can source in the UK, otherwise may be back in touch.
Tor Arne Kaasen: Interesting about the ford racing parts. I notice on
fordracing it says: "Kit contains high-flow rate fuel injectors, specially designed for race applications.
These injectors work best with air meters with revised calibrations. Not recommended for stock air meters."
Which sounds to me I might not get decent gains or fuel economy without some additional mods. This is for "spirited" road use, rather than for the track - I don't want fuel consumption to go through the roof. Maybe it depends how heavy your right foot is, ie normal flow rate is the same as stock injectors, it's just the max possible rate which is higher? Will do some further research...