I encountered my pet peeve earlier today while debating on one of the websites I frequent. Refering to England when you mean the UK is incorrect. Defending your use by claiming that the majority of citizens of the USA believe the two are synonymous is also incorrect.
The United Kingdom = Great Britain and Northern Ireland
Great Britain = England, Scotland and Wales.
The UK is a sovereign state and a country. England, Scotland and Wales are also countries in their own rights, incorporated into the United Kingdom. We use English, Welsh, Scottish, Irish depending on which part of the UK we are from, although we can also use British (refering to Great Britain and Northern Ireland).
Stop using England to refer to the whole of the UK. It is as incorrect as saying California when you mean the whole of the USA.
Skeptical kinkster musing on whatever takes my fancy!