Contrary to popular opinion (that of my neighbour), we've actually tried quite a few 'cat-detterrent' devices before finally succumbing to the electric fence. On the list of tried and tested are the 'Lions Roar' product.
Some quick research uncovered that none other than the 'Cat Protection League' recommend this as the 'ultimate weapon' against nuisance cats.
The advice comes from none other than Derek Conway, CEO of the CPL (there's a mouthful!) and his glowing report of Lions Roar could only lead you to the assumption that he's really good mates with the owner...
... because they're rubbish.
Lion's Roar pellets have a cunning logic to them. Cat's are territorial and mark using pee. Therefore get pee from the biggest cat in the world, soak pellets in it, and this'll have the cats shatting themselves (psychologically rather than physically, although the difference is hard to tell) and leaving your garden for good.
The problem is that this 'smell' detterent requires constant care and attention, lots of 'sprinkling' of the smelly pellets. The box claims that the silent roar will work for up to three months. In the African Savana, during the dry season, this may be so. But in the UK, during our near-continual rainy season - you'll be lucky to get a week!
The pellets ARE reasonably costed at approximately £10 a box, the box is reasonably generous... but they don't work.
The problem is that either the domestic cat takes one wiff of the pellet and craps in simply craps somewhere else in your garden, or (my personal theory) the common in-bred domestic cat has such an addled pretention of its own importance it feels comfortable going pee-to-pee with the King of the beasts!
A further issue is that similar to the 'pee on your own garden' marking trick, its quasi effective and results in my garden smelling of man or lion pee. Or my daughter digging about in my own pee, not ideal...
We have now gone 20 days sans crap thanks to the Electric Fence. This included the 4 day camping holiday ... we haven't heard any "Riowws" from the back garden so we think they've got the message. It take me all of 15 seconds to turn on the 'cat-zapper' as we fondly call it, nothings dead yet (the plethora of zapped dead birds forecast by my soothsayer neighbour hasn't appeared, but maybe she should have paid attention at school) and the only living things zapped so far are:
a) Cats.
b) Me, testing the wire.
And theres a live frog living in my garden (which I might nickname 'the Green Zone')...