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Heathrow Airport has issued an important message to any Brits planning to travel abroad soon. The London-based facility posted its alert on X, formerly Twitter , earlier today, encouraging prospective travellers to sign up for key alerts. "Looking to book your next trip from #Heathrow ?", the post read. "Whether you're relaxing on the beach or engaging in extreme sports, make sure to check the latest @FCDOtravelGovUK travel advice for your destination and sign up to http://GOV.UK email alerts." The Foreign, Commonwealth and Development Office, or FCDO, is the UK Government department responsible for handling the country's foreign affairs and providing advice to citizens abroad. Online, it offers an A-to-Z list of 226 countries and territories, including details on ongoing incidents, safety, entry requirements, and other essential travel information. Similar travel guidance related to health can also be found at the TravelHealthPro site, operated by the National Travel Health Network and Centre (NaTHNaC) . This offers specific details on disease outbreaks and ongoing concerns, along with vaccination guidance. Travellers are generally advised to check health advisories and vaccination details at least eight weeks before their departure. Beyond this, the FCDO encourages Brits to use its foreign travel checklist to ensure they are fully prepared. The checklist, available on the FCDO website, details the following key points: Despite this, the Government's website warns: "Our foreign travel checklist aims to help you plan for a trouble-free trip. It is not exhaustive. No foreign travel can be guaranteed as safe, and you take personal responsibility for your own travel." For more information, head to the FCDO's travel advice website or TravelHealthPro here. The UK Government's full list of what is considered hand luggage liquids on flights is below: Liquid carry-on rules differ depending on the airport. Before your trip, verify the regulations at your departure airport, any airports you’ll pass through, and on your return journey. The Government's advice adds: "At most airports, you cannot take liquids in containers larger than 100ml through security. This still applies if the container is only part full. Some airports may allow you to take liquid in containers that hold up to two litres of liquid. "Check for exemptions if you’re taking baby milk or food, medicines, food for special dietary requirements or liquids bought in duty free."