We were posting at the same time!! LOL
Anyway, as far as the vetting process, please do some research on this, it may be different in the mainland but it's actually up to the agency to do the vetting proceedure.
I assume you have a reference and paperwork from your last job in the states? You might want to contact your last employer and ask them for your work records. Your police check from that job will be in there.
As for your qualifications, l have an equalivant of a NVQ3 but it's not recongized here in the UK and would have to spend over £3000 to get an NVQ3 here in NI, when l already have the American version! It sucks big time because of it!