In the 21st Century every city in Great Britain has roads
London is the capital of England and of the United Kingdom of Great Britain and Northern Ireland. Great Britain consists of England, Scotland and Wales. The UK consists of Great Britain and Northern Ireland.
Great Britain is neither a city nor a state; it is an European country, otherwise known as the United Kingdom.
New York
Great Britain is formed from England, Scotland and Wales. The United Kingdom is Great Britain and Northern Ireland. So the answer is YES, Great Britain is part of the UK.
London
Great Britain.
Calais
Leeds
It's the capital city of England and Great Britain.
they were built around Newcastle, great Britain.
London is the capital city of Britain, of Great Britain, and of the UK (United Kingdom of Great Britain and Northern Ireland). (see related question)
Lord Mayor is the title of the Mayor of a major city. Great Britain is a country and as such doesn't have a Lord Mayor.