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Comparing plans on headline price is misleading once usage exceeds the allowance, because overage is typically charged at several pounds per gigabyte. Adding the overage to the cheaper plan often reverses the answer entirely.
Plan comparison
effective cost = base cost + max(usage - allowance, 0) x overage rate
Only if you use it. Most people buy 2-3 times the data they need, which is precisely what operators price for.
Some plans slow the connection rather than charge. That is usually better value, but check whether the reduced speed is usable for your needs.