As Dzug states, 'embassyhomepage.com' is a commercial site, which is notorious for its inaccuracies.
The European Union officially recognises the whole of Cyprus as part of the EU but, for all practical purposes, Northern Cyprus should be regarded as separate.
However, most tourism is to Southern Cyprus, so normal EU rules regarding passports apply. i.e. under EU law, any member state must admit any EU citizen who can provide valid documentary proof of citizenship. Assuming that you hold a UK (or other EU) passport, you could arrive in Cyprus at one minute to midnight on the very last day of your passport's validity. The immigration authorities would have to admit you. EU law gives them no choice.
If you're still uncertain, contact details for the Cyprus High Commission in London are on the web page of the Cyprus Ministry of Foreign Affairs:
http://www.mfa.gov.cy/mfa/mfa2006.nsf/All/FC4A 1759078D06ECC22571BD002B1BAB?OpenDocument
Chris