Absolutely. You could just literally stop showing up one day, it is the company’s problem at that point. 2 weeks notice is expected, and giving less is considered a bit of a betrayal, but it’s perfectly legal. As much as like the idea of having the security of a contact, being forced to work honestly seems kind of strange to me.
no-one's forced to work by a contract of employment
you can quit on the spot and ignore the notice period, and they can try suing you for lost business as a result, which is quite difficult to prove to any sort of standard
whereas it's generally very easy to go after an employer if they don't pay your notice if they sack you on the spot
