Hi, James,
if you are in the South east there is what appears to be an old Needlespar mast in the overflow park at Whitstable Yacht Club. if you ask them nicely they might let you have it for free. it needs some work on it though because the spreaders are a bit bent but nothing major.
Ta, Ben
N2743 (for sale, see further down the page. apologies for this unscrupulous plug). :P
James, Have you seen the post Andy Pickerell made recently (11th April) on the discussion board, not sure if all his stuff is still for sale. If it is then it might get you started.
http://www.national12.org/cgi-bin/Blah/Blah.cgi?b=Cool,m=1144763985