What is the capital of the UK

What is the capital of the UK It is the capital of (the USA/the UK) the capital city of the uk is london what country is south of the uk? what country is north of the uk? what country is east of the uk? What is the capital of France? What is the capital of America? what is the capital of Canada? what city is the capital of china? What is the capital of China? What are the first three letters of the capital of UK?