The Hebrides are arguably British. They are not part of Great Britain.
The sources are about the United Kingdom[0], which isn't Great Britain either.. the slang Britland doesn't distinguish between any of the above, other than sounding derogatory.
[0]: https://www.openreach.com/big-switch-off
The sources are about the United Kingdom[0], which isn't Great Britain either.. the slang Britland doesn't distinguish between any of the above, other than sounding derogatory.
[0]: https://www.openreach.com/big-switch-off