HobNob was a brand of biscuits. The Seventh Doctor's favourite biscuits were chocolate HobNobs. (PROSE: Cold Fusion)
Angus Selwyn offered the Eighth Doctor and Liv Chenka HobNobs, to which he was partial. The Doctor was disappointed when Liv declined on both their behalves. (AUDIO: Absent Friends)
The Ninth Doctor liked games, as they allowed a person to hone their reflexes, practice their strategic thinking and because they could be played with a cup of tea and a packet of HobNobs at hand. (PROSE: Winner Takes All)