Sammyduke - if you are successful in your application with any UK airline, you will need to provide CRCs from all the countries you have lived in.
For example I lived in France for 3 years and therefore to obtain an airside pass I had to provide a British CRC and a French "Bulletin casier judiciaire numéro 3".
Think twice about lying or "omitting" information on any application form as if you are found out; lying is gross misconduct thus a sackable offence.