Long story short- woman leaving my team in two weeks through voluntary redundancy. She's worked with us for about 18 months.
I manage her line manager who also manages the other four people in the team.
The VR comes after on-off informal capability process and numerous spats with one colleague in particular over her laziness and lack of initiative. The whole team know she doesn't pull her weight and are privately counting down the days until she leaves please don't think senior managers don't know what's being whispered about!
Whilst they are pleasant enough to their colleague day-to-day they have all chosen not to put in the voluntary fiver for a leaving gift- normally vouchers.
WIBU to give the departing colleague a £10 voucher (mine and line managers contribution)- the alternative is I chip in £25! 
(Before anyone says speak to HR, we are the HR department and this isn't an HR issue!)