When i was in hospital just before a inspection I rang them up and explained told them it wasn't a good time and they'll have to choose another date, they were quite happy to oblige knowing i was sick.
With that being said, I never "spring clean" my house for an inspeaction, I tidy it up, clean the bathrooms, any noticable marks on the walls i get rid of (but i try to do that anytime i see one) and do a quick mop and vacumme before they come. Thats all.
I believe thats all you have to do, it shouldnt be show room standard, It's your home and you + others live in it!

I think it's quite rude of them personally.