The UK NARIC is the National Agency for the Department for Education and Skills (DfES). They are the only official information provider on the comparability of international qualifications from over 180 countries worldwide.
If you qualified overseas, you must produce your qualifications to NARIC who will assess your qualifications and record what they are as an equivalent to UK qualifications.
Most EU countries recognise the qualifications of other EU states.
For more information go to the NARIC website.