Inspired by Willy Wonka, McVities created the lickable lift in the offices of communications company Engine.
Uh...
Just in case you're also thinking dirty, unsanitary thoughts, not to worry: once a Jaffa cake is licked, it's removed by the bell boy (out of shot) so no one else can tongue the slobbered-on snack.
That bell boy's got some strong mental images stored, I'd bet.