Британия(Blighty was the inevitable British soldier's corruption of it. But it only came into common use as a term for Britain at the beginning of the First World War in France about 1915. It turns up in popular songs "There's a ship that's bound for Blighty", "We wish we were in Blighty", and "Take me back to dear old Blighty, put me on the train for London town", and in Wilfred Owen's poems, as well as many other places.)
wiktionary.org)