I think if your a carpet and upholstery cleaner, there wont be much demand.
Perhaps if you are a pest controller, then there probably would be.
As far as rodents go, I think the local councils handles these and there's also a plethora of would be assassins at the local air rifle club, dressed in combos with the latest night sight technology who would gladly take the little blighters out for free.
![Grin ;D](http://www.cleanitup.co.uk/smf/Smileys/classic/grin.gif)
If my memory serves me right, Ive probably had 4 inquiries in ten years for fleas or carpet moth.
If you want a lucrative add on to your business that will generate £1000s of extra income a year, your probably better going for..