To be fair, if they're retired, they just siphon their retirement money out of the UK and pay a lot of sales taxes in Spain while they're also helping the Spanish economy with their consumption (money which is then ideally/hopefully also used to pay corporate and income taxes). Income tax is not the only tax there is.
How or why is it unreasonable? Is it not working for the EU so far?
You're just being unreasonable because the EU can demand what it want, you're free to not accept it, but if you say it's unreasonable you have to explain why exactly. So far you just repeat the claim that it were unreasonable without giving a good reason, that's unreasonable.
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