This does my nut in. Why do people do the gift thing for colleagues who are moving to another job? Retirees or folk who have been colleagues for a long time maybe, but anyone else can GTF.
Also, by consultant do you mean someone who isn't a permanent member of staff? If so, then double GTF!
Besides, the c*** has let you all know he's leaving your workplace at very short notice. Doesn't sound like a particularly close colleague.