Nop ! You are not in Britain.
I am in Britain, in France !
And you, you just are in
Great Britain !
This is just why we're so easily confused. The Romans said we were Brittania but over here we don't know who we are.
I think I'm English, or British. My friends and relations in Australia think we're Poms or Brits. If I get in the car and go to France I have to stick GB on the back. If you look on a map now there is no Great Britain any more, only the United Kingdom. If I need to select my country on a computer I can only choose UK. Foreign tourists think England is a pub. I don't know if we're a Kingdom but we certainly are not united.
If any of us are in the Olympics, or other sporting event, we become GBR. For years I thought we didn't have anyone competing.
We were all sat there saying "who is this GBR lot with our flag? Haven't they got one of their own?"
I can't understand how Britain, that isn't particularly great, can have so many different names and abbreviations. Apart from all the names we are called. At the end of the day, maybe we don't really know who we are?
But as I say I'm easily confused.
(mind you we have become extraordinarily good at riding a velo, must be the French and Italian DNA from the invasions)