I was wondering about that too AliBaby....no way am I flushing my dog's poo down the toilet...
I had no idea it was illegal..is it just for human faeces or all faeces?? Otherwise, I am wondering what we are supposed to do with our pet's faeces? Not like there is anywhere else to put them other than in the bin?

That's a bit disrespectful, putting pooey nappies in your kitchen bin! Do these people know that you prefer that the poo went in the toilet? Maybe they just assume that you just put it straight in the bin? Maybe a couple of signs on or near your bins would help to "educate" your guests?