Northampton Motorsport have a couple of Focus's running around on Weber Alpha Management and one has throttle bodies, the other has the new Titan Motorsport Roller Barrells. They are also an Omex dealer.
Give them a shout on 01604 766624 and speak to Troy.
Alternatively
Dave Colledge at Retro Ford does a nice kit which includes Jenvey Throttle Bodies and Emerald management and I think Daves kit is about £1400 give or take a few quid
He has an advert in Classic Ford, it will say in there.
His number is 01536 747978
The nice thing about Northampton Motorsport is they have a rolling road there so they could map it all up for you and everything.
To give you an idea, a 2.0 Zetec in standard trim is about 130bhp
They normally go straight to 160-165bhp on bodies and decent management.
Hope that helps