yeah yeah yeah. cutting was an option although i did try and progress was slow. Also i dont have half the equipment and if im gonna spend £20 buying stands, new hacksaw blades etc would rather stump up for a professional to do it. Found this which was good: http://www.carlgerrard.org.uk/seatpost/ for anyone who does want to try cutting method.
really what i wanted to know when i started was who i can go to in london who'll do this for me (which vinyl villian kindly answered 3 days ago!)