I hear ya :) Tho if money is no boundary you might look into some of the heads which Wimberley make:

http://www.tripodhead.com/

Well - OneStopDigital - isnt UK, but will pay your VAT if you get landed with it (guaranteed):

http://www.onestop-digital.com - i got some stuff from there before with no trouble.

But if you want to look specifically for UK try these two second hand dealers - sometimes you might get lucky - tho the second hand market tends to be dominated by canon and nikon in my experience of these sites:

http://www.t4cameras.co.uk/
http://www.mpbphotographic.co.uk/index.php

Bristol cameras tends to pop up a lot when i look for decent priced lenses so you might try there as a retailer:

http://www.bristolcameras.co.uk/

Otherwise google is your friend... hit the "Products" tab and fire away with model names :)

"In every colour, there's the light.
In every stone sleeps a crystal.
Remember the Shaman, when he used to say:
Man is the dream of the Dolphin"

Rich Meadows Photography