Waitrose is the local supermarket I tend to frequent. They do a wide range of 'own brands' and this is one of them. I love pate (NOT the low-cal variety though) and had been giving Keeper his medication in that.
One day I was in a hurry and accidently bought the low-fat variety by mistake. I used it up on Keeper and he loves it. Being low fat, it is better for him.
Pate (there should be an acute accent over the 'e' -) is normally made from pork. It is spreadable and you can get smooth, coarse (farmhouse) or medium types. 'Ardennes' is a common one, so is 'Brussels' - they are pretty similar, supermarket to supermarket.
One I particularly like is Wild Duck but most good supermarkets have a Deli counter and you can get a wide variety.
Hope this helps.