My next door neighbour was always putting bird food and stuff out for the birds, then you would see her 'flying' out into the garden to chase the sparrow hawk away

We have a cat problem. I don't put food out - just grow many trees and mature shrubs so that they can find their own food, and they are not all attracted to the same spot. The black birds can root around the flower beds/vegetable plots (where they are little vandals

) I am going to put in a small pond when I get the time.
With the cats, I used to put holly cuttings under the hedges, but, as my daughter pointed out, that inconveniences the hedgehogs. When they are new, I shout, hiss, clap, run at them and they are very quickly trained to leg it the moment the key is turned in the door.......... Sometimes you get a stubborn one, then you need to be persistent and maybe use the supersoaker/hose if you get the chance. I am not sure what they get up to when I am not there though.
We have an influx from nearby flats

For some reason, you get a nuisance one for 2 or 3 years, and then they disappear..........

This year we have a persistent one that has shinned up the tree to the nest box. I am thinking of rubbing a pound of lard around the trunk - or will this just attract more cats?