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What % of our OAPS are in Spain vs theirs?
That's exactly the point; obviously there's many more British OAPS in Spain (and France) that there are of Spanish or French nationality in the UK.
Because working migrants pay tax, they would self subsidise (to a degree) when working in the UK. We'd still be left with a large deficit when taking into account the number of non-working expats who live in Europe.
Yeah but what are we actually comparing? What % of our OAPS are in Spain vs theirs?
It might be a fact, but it's pointless.