Calculations as it so retro to see a scanned back of the fag packet calculation
They covered this on Radio 4 and the short answer was no one knows.
All the studies are political in nature and assume loads of red tape etc for the cost savings which is highly debatable to put it mildly.
FWIW each of the other members pay a % of their Gross national income to us in rebate to reduce our contribution so they would also be paying less if we left - Win win scenario??