its with HEL,think its 10%,just mention the forum to them. i only got the single rear brake line,he was a bit reluctant to give me the discount but gave in eventualy,so id get all 3 lines at the same time if i was you (id put goodridge on the front,only changed the rear cos i put on the thou rear caliper upgrade)
hope this helps,im sure someone PC clever will be along to put a link up for ya
ps,the topic your looking for is on page 12 in here. and its 25% off,not 10%