They not only don't give a fuck the only thing they do give a fuck about is compensation for the higher ups and stockholders.

In the U.S. where unions have been ostracized for years or beaten down until ineffectual regarding any kind of working condition, if workers were to forgo giving a two week notice to an employer there's a good chance of never getting a decent job reference when seeking a new job. It sounds like P&O already had cheap undocmented aliens ready to take the place of the former UK rank & file. The UK .gov knew of this action before it happened.

BTW: this is what Brexit is all about in the UK, corporate political donors getting whatever they want and to hell with the workforce. Though of course it wasn't sold to the UK electorate as such. This is exactly what Brexit is really about, hire and fire at will , and no rules and regulations.