Amazingly, the company still seems to exist, or did until recently. "Incorporating World of Video Professional Tapes" no less! Sign claims to offer "duplication services".
Predictably enough, was a branch of Midland Bank until 1977 when "Professional Tape Marketing" took it over. Known as "Cassette House" at some point. Could do with a bit of sprucing up now
Web address (
www.promags.co.uk) is dead.