What documents are essential for legally driving a car in the UK?

To legally drive in the UK, you need to ensure you have the right documentation, which boils down to proving you're qualified, insured, and that your vehicle is roadworthy and taxed. The driving licence proves you've passed the required tests and are legally allowed to operate a vehicle. Insurance is mandatory to protect yourself and others in case of an accident, covering potential damages and injuries. The MOT, or Ministry of Transport test, is an annual safety check for vehicles over three years old, ensuring they meet minimum environmental and safety standards. Finally, road tax, officially called Vehicle Excise Duty, is a tax you pay to keep your vehicle on public roads. So, while a mechanic's report or a road map might be useful, and a passport is essential for identification in other contexts, they aren't the core documents required for the simple act of legally driving a car in the UK.
Think of it as the 'L.I.M.R.T.' - Licence, Insurance, MOT, Road Tax - the four pillars of legal driving.