The United Kingdom is one of the most notable and influential countries in the world. It is a large financial hub as well. They colonized and settled a grand part of the world. The Americas, Africa, Asia and Oceania all have a past which involves Britain. For example, the British settled in what is now, New Zealand, US, Canada and Australia. In other parts of the world they started decolonizing during the 20th century. For example, British Raj was handed back to India and then due to demographic reasons they split into various countries like India, Pakistan and Bangladesh. English is a universally spoken language in a lot of the world due to the British's massive reach and influence.
The national currency is the British Pound Sterling (GBP). It is one of the most traded currencies in the world. British banknotes usually feature royalty on them such as Queen Elizabeth II. You can find her on British banknotes as well as on many other countries banknotes such as the Jersey, Falkland Islands, Bahamas, and Fiji. Another prominent figure on their banknotes is Winston Churchill. He is found on the 5 Pounds from 2016 but, he is even found on Gibraltar banknotes too. The United Kingdom has started using polymer banknotes due to their security features and long durability.