The British unit of currency is the pound sterling (£).
From credit cards, cash, and ATMS to VAT refunds, travelers checks, and customs limits
How to exchange your dollars for pounds at the best rates (and lowest fees) possible
The Queen doesn't need a passport. Since all British passports are issued "In the name of Her Majesty," the Queen can just vouch for herself—though her husband Philip, son Prince Charles, and everyone one else in the household do have passports.