From May 1986: A MARVEL UK House Ad with itinerary details for the Marvel US-organized (apparently as "thank you" overseas trip for the X-creative team) signing tour to promote the launch of the new CLASSIC X-MEN monthly.
It's unlikely that a few extra copies flogged in the UK was going to make much difference to the overall sales figures so this was clearly a "working vacation" ruse on everyone's part.
This was not the same tour that saw the team appear on TV-am's GOOD MORNING BRITAIN... that took place the previous year.
CLASSIC X-MEN, which reprinted the New X-Men strips from a decade earlier, turned into a canny launch for Marvel. It eventually clocked-up an impressive 110 issues through to 1995.
It became X-MEN CLASSIC from the 45th issue, presumably to group it alongside the other X-books on retailer paperwork and on the shelves.
Those initial four-odd years also included new material (supplementary pages of new art and back-up strips) intended to anchor the past events to current continuity or explore additional facets of the original storyline.