Hi ummmm,
I think £800 is way too excessive for your lovely Grandad to give to the care home/nursing home workers as a Christmas bonus ......they will then expect that every year, which is not fair to Grandad.......a box of chocolates and perhaps a £10 one4all gift card ( they will have a choice of goods from loads of retailers then ) from the Post Office seems about appropriate.
Hope you, and all your lovely family have a wonderful Christmas, yummy mummy. :0) x
http://www.one4allgiftcard.co.uk/