Well after a few months - I thought I would update everyone about the Lion Poo story.
Basically applied it after getting annoyed at cats using the garden as a toilet, harem and anything else they wanted.
In our new house we have had a problem with cats - in the back garden to be precise.
Basically the previous owners didn't care about the back & left it grow wild for around five years and all the local cats got very used to using the back garden as a litter tray.
After clearing the weeds it's now a case of how to stop them from returning