http://www.theregister.co.uk/2006/10...mmigration_db/
I really don't think they do share criminal record information on every passenger....doesn't sound like it above either.
http://www.theregister.co.uk/2003/09...abres_over_us/
the data "is checked against the combined federal law enforcement database, known as the Interagency Border Inspection System (IBIS). IBIS includes data from the databases of CBP and twenty-one other federal agencies. Names are also checked against the FBI's National Crime Information Center wanted persons database."
the only two countries I can find that openly share criminal record info are the US and Canada...nothing else anywhere about the UK/US.
have you got any concrete evidence they share this info jay?....i'm really hoping they don't is all!