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'Retailers have been taking advantage of our compliant attitude in airports', says Simon Calder

'If you challenge them, you're told all kinds of nonsense.'

'Say you buy a bottle of sun cream for £6; the VAT is £1. If you're flying to Greece, the retailer pays that to treasury. But if you're going to Turkey – which the retailer can find out by scanning your boarding card – it stays in the retailer's pocket.'