From November 1983: an advert for the officially-licensed DOCTOR WHO TARDIS PENCIL CASE that will be very familiar to readers of MARVEL UK's titles at the time.
I think this was also sold in stores... I never had one but I have the vague memory of seeing it on sale in WH Smith. The memory may cheat.
November '83 was, of course, the show's twentieth anniversary and, probably, the show's peak before the swift decline that saw it cancelled six seasons later.