Hi Gavin,

What you seek is very hard to find, but you can try The Lee Co. they
have a sales office in England:

Lee products Ltd.,
Tel: 01753 886664

Good luck!
--
Yit-shun Leung Ki
Graduate Student in Microfluidics
_______________________________________________________________
Institute of Microsystems (IMS)
Dept. of Microengineering,
Batîment BM,
Swiss Federal Inst. of Tech. (EPFL),    TEL: +41 21 693 7818
CH-1015 Lausanne                        FAX: +41 21 693 5950
Switzerland                             URL: dmtwww.epfl.ch/ims