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villa-ru-
£100 tap n go now though (unless one has changed it).
Good point on the card-no-auth limit but that should be different from a shop floor limit and what their computer sends through for online authorisation. If you are a coffee shop with 90% of your transactions below £30 they may be approved locally but anything higher is checked for example.
jellybaby
That shouldn't work. All spend over a certain amount, that varies by store and risk profile, are online authorised. Should also require a PIN too. But it's probably setup wrongly somewhere.