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Ackshually this is contractual law, not tort (tort is civil harm/wrongs - like negligence etc). Leading case is one of the few case names I can ever actually remember, mainly because of the in-depth debates about whether putting something in a shopping basket is acceptance of an offer: https://en.wikipedia.org/wiki/Pharmaceutical_Society_of_GB_v_Boots_Cash_Chemists_(Southern)_Ltd#:~:text=The%20Court%20held%20that%20the,of%20an%20invitation%20to%20treat.
That was in the good ol' days of metal shopping baskets, rather than virtual ones.
You (and most of us) need to read about English law - it's the branch called TORT. Putting an item in a window with a price is just an "invitation to trade" from the seller, it's NOT a binding offer, which is a shame :-( Surprisingly, it's you that makes the "offer" when you go in and quote the price, they can refuse your offer.