Essentials in United Kingdom

For all non-European Union nationals, passports must be valid for three months beyond the intended length of stay. EU citizens can enter the country on their national identity card. There are no specific health risks associated with travel to the UK and food and water can be considered safe. The British National Health Service is commendable; emergency treatment is free to visitors, but charges are made for routine medical care. Driving is on the left and a national driving licence is required. Shaking hands is the usual form of greeting, for both men and women. Casual wear is widely acceptable in the UK.

Essentials organisations in United Kingdom
HM Customs and Excise
Holiday Care Service
Home Office Immigration and Nationality Department
UK Passport Service