I just found this great deal. It is available at http://www.three.co.uk/.
Pay As You Go Unlimited Calls - Text - 4G / 5G Data - £20 Monthly @ Three
Unlimited Data
Get unlimited minutes and texts
Go Roam in 71 destinations around the world
Choose as much monthly data as you want
5G Ready at no extra cost
£20 Monthly
20GB - £15 Monthly
10GB - £10 Monthly
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