The mail order people I buy all my Reliant spares from. They've got a small shop in Selby, Yorks but do next day mail order. Proper old school motor spares people -I've been to their shop & they really do wear those brown warehouse coats & have shelves full of aging cardboard boxes of Reliant bits! Very helpful & happy to advise on any problems over the phone.
Reliant parts hotline 01757-270002.
http://www.michaelsofselby.co.uk/michaelsgarage@btconnect.com