Well I went to my local Tesco and filled my trolly. Helpful chap even went back to the warehouse to bring me the last box of the mixed supermeat selection - he was apologetic there was no more of it, but they were expecting a delivery later. Didn't have any objections from any members of staff regarding the number of boxes I had in my trolly, only the odd "oh look, a mad cat lady" expression on some faces...
So I'll be off back to town tomorrow and stock up with some more along with the odd 800g bag of Purina One (don't need over much as I've still got a fair bit of RC & Perfect Fit) as well as pop over to Waitrose to take advantage of their offer on the boxes of foil trays as my two like those too.
Has anyone noticed how hard it is to steer a trolly full of Felix?