Paddington coaches stop in marked coach bays on Bishop’s Bridge Road, just north of Paddington Station.
There is no postcode because the coach doesn’t stop outside a specific building. However, using What 3 Words we have identified where on Bishop’s Bridge Road, Paddington it stops: https://w3w.co/beans.with.baking (51.518313, -0.17965200).
Set What 3 Words to satellite view to identify the surrounding landmarks.