Thank you so much Ms CJH for your recommendation following my blog comment on my pesky cats.
I’ve been on to a website called www.vetuk.co.uk and ordered plug-ins and spray of a product called ‘Feliway’ which has had rave reviews in the UK and states. It’s a pheromone which makes cats feel happy and content in their new home and not want to wee on my carpets or attack my furniture. With 4 cats it’s difficult to work out which one it is but I have my suspicions its Oliver and Martin (the 2 boys) doing the damage. I will let you know how I get on when it arrives!