I would love to know the answer to that question myself. I shall keep an eye out on your answers.

Oranges!! cats hate them, shove some orange peel in your rubbish bags or put a little bit of orange oil on the outside of the bags.

if you are sure it is cats not foxes or badgers then as boo says oranges are good or even pepper white is best but black will do but pepper only works if it stays dry

rub raw hallepeno or birdseye peppers on the sack. or even easier, chop afew hallepenos, put them into boiling water. let the water cool. put into a plant sprayer. spray onto anything you don't want chewed. it's a very organic way to put off pests. i know a girl who carries it as an anti assault device. it burns like hell but is quite harmless. our dogs used to eat stones when they were younger. they don't anymore lol. took 3 days to stop the first one. it can also stop horses chewing the wood in stables. there's a thing called cribox that is a sticky paste that is hot tasting, but animals seem to get used to it. something hotter gives more incentice to not chew something. i hope your dustmen wear gloves because if they touch their willy to pee after touching the bags, it'll burn like hell.

yes i know a good treatment for that a dog

Just wait.

Sooner or later you'll be issued with wheelie bins and fortnightly collections. Then you'll start to suffer!

(Yes, I'm bitter because I just heard the bin lorry leaving and I forgot to put the bin out last night so now I've got a full bin and another 2 weeks' worth of rubbish coming with no way of getting it collected).

The cats don't like pepper sprinkle that around.

Separate out your biodegradable waste and compost it. Then there will be nothing to attract animals in your sack.

I may be wrong, please tell me if I am, but my understanding is that cats do not have owners from a legal responsibility point of view.

If it were a dog, then the owner is responsible for their misdeeds.

My logic on this is that you are legally required to inform the owner and/or police of an accident involving a dog, but there is no legal requirement for this if you run over a cat. Moral, yes, but not legal.