My cat is nearly 3, and spent the first year of his life mostly as a house cat - he has always been fully litter trained and bar the odd accident, uses his litter tray religiously. We moved house when he was a few months old, and he started to venture out, and eventually even managed to use the garden for his, erm, deposits, instead of the litter tray.
A few months ago, we moved again. He stubbornly will NOT leave the house for more than a few minutes, certainly not to go to the toilet. His litter tray is revolting, as soon as I clean it, he's used it again and scraped litter all over the room. He's also started having more accidents - poo on the bed, wee in the log basket 
etc.
I need some help! How can I convince him to go outside, and ditch the litter tray?!