DTek - Little Thetford, Camebridgeshire
Currently DTek don't seem to have a website, but the owner (Kevin Dunseath) can be contacted by email and telephone.
As far as I'm aware, Kevin sells all/most brands of recumbent bike and trikes (both delta and tadpole).
Stock held by DTek is both new and used and he is a nice guy to talk with too!
Email: dtekhpvs@btconnect.com
Tel No: +44 (UK area code) (0)1353 648177