I'm no expert in describing cats, but he looks like a medium haired tabby. Love the markings! In terms of breed, he's a Domestic.. not a specific breed.
Have you checked him or her for a microchip? If no-one owns him, are you keeping him?
Hi Mani thanks for that, much appreciated. Yes I took him down to get him checked and he is not micro'd which is a awesome thing haha yep he's all mines now.