Casually, but incorrectly, YES!!!
The full title of the country is 'The United Kingdom of Great Britain and Northern Ireland'. The title is shortened to 'Uk, United Kingdom, GB , Great Britain, Britain, and erroneously England.
The UK contains the following nations England, Scotland, Northern Ireland and Wales and the Channel Islands. The Isle of Man is Not part of the UK , but holds a separate legal status.
As England is th largest of the kingdoms and the most dominant, people erroneously refer the the UK as England.
The Scots can often take offence on being referred to as England. So in Scotland be careful to refer to Scotland or Great Britain, but NOT England.