All passengers (including any pets that are travelling with you) will need a valid passport. Up until 30 September 2021, citizens of the EU, EEA and Switzerland will still be able to travel to the UK using your national identity card. From 1 October however, you will need a passport to travel to the UK that is valid for the duration of your stay.
A driving licence is not a valid document for travelling abroad.
If you are a UK passport holder and lose your passport whilst abroad, you must report the loss or theft as soon as possible to the local police and the British Foreign & Commonwealth Office (FCO) or Embassy or High Commission of the country you are in. To obtain details of a local (FCO) post, please call +44 20 7008 1500 (0845 850 2829 within the UK) or visit http://www.fco.gov.uk/travel
You will need your full driving licence documentation and proof of insurance, as well as the original Vehicle Registration Document (V5). You’ll also need a UK sticker for your vehicle. If the vehicle you are driving is borrowed, hired, leased, or a company car, it is vital that you carry a Vehicle on Hire Certificate (VE103). For more information on travelling with a hire car, visit https://www.bvrla.co.uk/resource/Taking-a-vehicle-abroad.html