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I did buy a voucher at tesco from outside the UK yesterday before posting my answer. And paid with a non-UK card. Then got the voucher by email. (The only unexpected problem was that neither 4444 nor the landline number worked in the country where I ...

Now you can also by an electronic voucher online at Tesco (and pay with a foreign card). https://www.tesco.com/phones/products/05000462191570