Considering how all the cat owners other than VIRII are unable to see that they are being unreasonable, selfish and inconsiderate by being unable to accept that it is wrong for their pet to crap in my garden I have decided on the most humane approach I can think of.
Having done a little research I have decided what my garden needs is some plants around the border of my lawn.
Daffodils are a good bet.
Some branching ivy.
English ivy
Mistletoe
Onions
I am considering sprinkling apple seeds all over my lawn as well. I believe these plants are quite toxic to cats.
Therefore I now accept it is perfectly acceptable behaviour to allow their cat to crap everywhere in my garden. I have no doubt that the same cat owners have no issues at all about what plants I decide to grow in my garden.
Your cat will be perfectly welcome to venture in my garden and leave its little toxic waste parcels, but it does so at its own risk and has to risk getting a little toxic waste back at it.
Oh, the joy. I am off down to the Garden Centre first thing tomorrow.