I think the scent from a cat keeps mice from making themselves at home. If your little mouse spots your kitten who will try to play with it I think the mouse will go.
Cemeteries are for people's loved ones. There are enough open spaces in London for people to walk their dogs and I am a dog owner. The people that would wish to visit their loved ones graves over the Easter break are now unable to do so.
I have also seen Roisin in the park with her owner who is a lovely person and Roisin is always very well behaved and enjoys playing alongside lots of other dogs. Always a pleasure to meet them both in the parks.