When did you last check your tyres both for depth of tread and air pressure? Most people do not check their tyres! Let alone there spare. People tend to rely on the annual MOT test to highlight tyre issues. The SPARE TYRE IS NOT required to be inspected as part of the MOT test, but for your own safety, it should be road legal and kept inflated. There is no point in having a spare when you get a puncture miles from anywhere, and find your spare is flat.