The bottom bike is a single-cylinder Ariel Red Hunter, circa-1950 ish. With the telescopic forks it's definitely post-war, but I'm not the full bottle on Ariel singles. I've got some Ariel info here somewhere I'll dig up to try and date it more accurately (the rigid rear end and distinctive tank-badge should help), or unless someone else beats me to it. I couldn't say for the scooter in the top photo.