As others have said, make sure you're paid before leaving - if you're genuinely leaving due to awful management then don't be surprised if they try and screw you every way.
Other than that, I can't imagine myself ever getting in the situation where I hated my job so much that I'd consider leaving without working my notice period. However, if that's honestly how you feel then even if they do try to sue you for not working to your contract then I'd assume you'd have plenty of examples of where they didn't fulfill their role as an employer.
Good luck, not working for 6 weeks over Christmas is likely the best time to do it!
Other than that, I can't imagine myself ever getting in the situation where I hated my job so much that I'd consider leaving without working my notice period. However, if that's honestly how you feel then even if they do try to sue you for not working to your contract then I'd assume you'd have plenty of examples of where they didn't fulfill their role as an employer.
Good luck, not working for 6 weeks over Christmas is likely the best time to do it!