Eurozone

The Eurozone or EZ was an Earth superpower which competed with the United States of America in the early 21st century. It was composed of 25 European countries, including the United Kingdom and France, but excluding Poland. Its form of currency was "euromarks", and it had a Eurozone Space Agency with a Geneva Control and a European Secret Service headquartered in Brussels. Their ULTRA computer was the most powerful computer in the world in 2010, located in a bunker beneath the ESS headquarters. Under the new drug laws, vitamin pills were banned, ecstasy and marijuana were legal (the latter more socially acceptable than tobacco), and nicopills replaced cigarettes but were themselves highly addictive. (PROSE: Trading Futures, AUDIO: The Feast of Axos)

The British Prime Minister signed the Euro-Combine treaty in the early 21st century, as did all other member-states of the European Union, which increased political ties further; some sovereignty was given up in exchange for the promise of a "united, integrated European superpower". The Internal Counter-Intelligence Service and other reactionary forces saw this as a threat to the UK's independence. (AUDIO: The Longest Night)

In 2010, tensions were high with the United States as both blocs had sent "peacekeeping" forces to North Africa. Italy was engulfed in civil war. (PROSE: Trading Futures)

The Eurowars split the continent in the early 21st century. Mariah Learman and Jonah Cosgrove fought in it. (AUDIO: The Time of the Daleks)(PROSE: Trading Futures)

Around the mid-21st century, the Eurozone Space Agency sent up the Jules Vernes. It had a second craft, the Johannes Kepler.(AUDIO: [[The Feast of Axos)

At some point during the 21st century, the world was being ravaged by the greenhouse effect. The Eurozone closed its borders after a millions-strong stream of refugees from North Africa and the Baltic Sea states; water shortages and riots spread through the bloc. (AUDIO: Hothouse)

Eurowars veteran General Learman took over the UK and renamed it New Britain in the mid-21st century. (AUDIO: The Time of the Daleks)

Behind the scenes
In reality, the is the collection of European countries that have given up their currencies and adopted the Euro.

Both Trading Futures and The Time of the Daleks came out in spring 2002 and tie in to each other by mentioning a Eurowar. Trading Futures refers to Learman's fall in the past tense, but the stories ended up being decades apart.

The creation of two hostile power blocs in the 21st century seems to be an explanation of who the powers in Warriors of the Deep are, since the Cold War had ended.