The only natural border around mainland Britain is the one you get wet trying to cross.
It has also become well established not only in mainland Britain but in other countries.
What's more, it is the sunniest place on mainland Britain.
I have not heard of a curfew on mainland Britain in the past century.
This death toll remains the largest number of deaths caused by a single explosion in mainland Britain.
How different was really "the enemy" from the rest of us here on mainland Britain.
It was the most northerly air ship station in mainland Britain.
It is the only university campus in mainland Britain with its own railway station.
They are being questioned about recent bomb attacks in mainland Britain.