Hi Edd,
The tablet is a sort of creamish colour.
Looking at it more closely the box the vet has supplied it in says drontal cat and has the vets sticker on it saying one tablet per cat up to 6mths of age, but the tablets inside are drontal plus and have a tiny picture of a dog on the foil wrapper, they also contain the same ingredients as on the dog tablet link you provided.
A bloomin good job I came on here to ask for advice, I shall be ringing the vets in the morning as they have clearly given me the wrong tablets.
Thanks for preventing a near disaster!
Lorna x