My mole(s) don't seem to mind red hot chilli pepper ... Nor do they mind the Defenders castor oil pellets.
At the moment, I'm opening up tunnels and filling them in, and because I'm working in the room overlooking the area they've invaded, as soon as I see a new heap, I go out and fill it in.
So far, there seems to be a three day lead time between this and a new mole hill, and while I'm not sure why, I'm known for my stubborn streak and willl keep at it till I'm up to lifting the huge slabs where most of the activity seems to be concentrated and getting them re-laid. Quite what I'll do if I find the nest is under there, I don't know...