The UK is generally regarded as a relatively safe place to travel, though petty crime is fairly common, and violent crime does occur, particularly in the cities. The healthcare system is of an immensely high standard and certain countries have reciprocal healthcare agreements with the UK.
No immunisations are required in order to enter the UK, and no specific diseases are associated with the country. The British National Health Service is excellent - hospitals and clinics are organised and clean, and doctors and other healthcare personnel are professional and well informed. Food and water are considered safe, but use your judgement wisely – certain hole-in-the-wall restaurants or street stalls may bring on a bout of travellers’ diarrhoea.
Safety in the UK is fairly good, though crime is a problem in certain areas, particularly London. Travellers who take sensible precautions usually experience hassle-free stays, so avoid walking alone at night, leave your flashy jewellery at home, and keep an eye on your personal belongings. The risk of international terrorism does exist in the UK, so stay away from large public gatherings and be vigilant in public areas.
Current advisory warnings about health and safety in the UK
British foreign office – UK webpage
Up-to-date and reliable advice on health and security issues in the UK.
www.fco.gov.uk
MD Travel Health - UK advice
Comprehensive medical advice on disease and health risks, precautions and remedies.
http://www.mdtravelhealth.com
Smartraveller
Australian Government sponsored site with detailed and current information on travel risks in the UK.
http://www.smartraveller.gov.au/zw-cgi/view/Advice/United_Kingdom

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UK travel information
UK travel tips
UK maps and geography
Essentials
Visas: Visa not required by EU nationals and citizens of Australia, Canada, USA and Japan.
Season: April - September
Money: English pound
Language: English
Emergency #: 112; 999