Our cat always goes out to go to the toilet, and is usually out all night after sleeping in the house all day. On these colder nights i have tried to keep him in, sometimes successfully I just wondered if he really needed to go would he use the tray or meow the house down till I wake up and let him out?

That question really depends on the nature of your cat. You'll have to wait and see- but if he knows how to use the tray- genrally they will use it. Train him to use the tray before you take any risks.

__________________
Yours,
Beth