Humbug (sweet)

A humbug was a sweet carried by the Fourth Doctor. He offered one to Gatherer Hade after their meeting adjourned. (TV: The Sun Makers)

Behind the scenes
Despite the Doctor calling it a humbug, the sweet taken by Hade was in fact a jelly baby. This incident is similar to one in Image of the Fendahl where the Doctor offers a jelly baby that is in fact a liquorice allsort.