Speed limits - identifying them. All you need to know as a car driver in the UK (but not Wales!)

For the UK, except for Wales... Signs? No signs? Types of road? Different for different vehicles? How can you identify the speed limit on a road if there have been no signs for many minutes? What's the National Speed Limit, and what does it mean to me? This guide covers all you need to know to drive a car on UK roads (except Wales) without ever wondering "What's the limit here?" and a little about other vehicles too. Do the speed limit quiz first, then again afterwards to make sure you've sussed it!