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This is likely from a hardback "annual" put out for Christmas. The British weekly comics mostly had annuals (some of the annuals outlived the comics they were based on, sometimes by over a decade!), which were a mix of reprinted strips, alongside ones specially made for the annuals (often with larger panels because the page count was not as restrictive), text stories and world-building.
The annuals based on TV shows, like this one, were often far more phoned-in, with very hastily-made, short comic strips and stories, world-building / "continuity" articles which often contradicted the shows, and pure filler; like the "Steady, Steed" page above, which obviously took 5 minutes to make.