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A job offer is as good as a contract IMO. It must be honoured by the employer as far as I’m aware.
A contract made and accepted verbally and then later withdrawn requires the employer to give or pay 7 or 30 days notice period depending on the contract terms. Unfair dismissal only applies after 2 years in service.
But, as the guidance you’ve posted indicates, an offer will only have been made, and become binding, if it has been clearly and unequivocally been communicated and accepted.
Asking the question at an assessment day: “if we are successful, will we be offered jobs or put into a talent pool?” and being told “you’ll be offered jobs”, as these candidates were, is neither an offer nor an acceptance, and no formal offer was then forthcoming.
The above thread makes it very clear that the candidates concerned were not, in fact, ever formally offered jobs as far as Virgin were concerned. TOC HR are well versed in the legal niceties of these matters and will avoid extending offers until they’re ready for you.