Gordon Brown until May 2010 and since then David Cameron. Although the Queen is head of state, the Prime Minister and First Lord of the Treasury heads up the government that runs the country.
Parliament.
someone
Runs the country
He is the Prime Minister of Britain, so he runs the government there.
The Prime Minister and Parliament, all elected.
There are many rivers that run through Britain :- The Thames The Severn The Trent The Hamble The Dee etc.etc.
Trinity house
The River Thames
The A1 runs from London to the England/Scotland border and then continues to Edinburgh which would make it the longest in England and in Britain.
Yes, that's essentially what many cars did in Britain and in Germany in WW2.
Channel tunnel thicketts
The Pennines. Known as 'The Backbone of Britain'
The financial year in Britain typically runs from April 6th to April 5th of the following year. It is different from the calendar year, which runs from January 1st to December 31st.