[twelvechairs]

[Edit for clairity: responding to 'On the other hand, Great Britain "includes islands...']

Even your quote starts with "Great Britain is an island", though it later goes into "Politically, Great Britain refers to the whole of England, Scotland and Wales in combination".

So realistically its correct both ways - you can use it as a geographical term excluding islands or a political term including islands

[yesenadam]

Not sure of your point at all, I find your comment totally confusing in at least 3 different places. Not worth going into I guess. Mine was mainly just that it doesn't include Northern Ireland. I only mentioned the other islands as it would be nice to see them in iceberg form. :-)

[onorton]

As someone who lives there, I would use "Britain" to include the other islands in England, Scotland and Wales but most people here don't refer to the main island specifically.