The magazine was launched in 1955, but became a national magazine only in 1968. Prior to 1968, several of the regional ITV companies – Westward Television, Scottish Television, Tyne Tees Television, Ulster Television, TWW and Teledu Cymru (and briefly WWN) – produced their own listings magazines. The Midlands originally had their own edition of TVTimes listing ATV and ABCprogrammes, but a separate listings magazine in the Midlands called TV World existed from 1964-68 before TVTimes went national. Until television listings were deregulated in 1991 the TVTimes was the only place where complete weekly listings of ITV programmes could be published.
Channel Television continued to publish its own listings magazine until 1991 (it was feared that the company might go under without the revenue from its own magazine).
Info gleaned from Wikipedia