Oh God - the Bay City Rollers. I have been meaning to read Les McKeown's autobiog. I loved Eric when I was 13 (I have seen recent pictures and it's not pretty)
"Dry lining" sounds like the use of illicit drugs to me, Talbot.
I can imagine a 1960s hippie, with long hair and an even longer sheepskin coat, turning to his friend and saying "Hey, up are up for some great dry lining tonight, dude? I've some some real good gear!"