Form Gov.UK
“It’s written and signed so it’s legal”
A contract term and notice has to be fair to be legally binding on your customer. If it isn’t, they can challenge it – including in court if necessary. Enforcers (such as the CMA and Trading Standards) can also bring cases to stop you using it.
So unfair terms are not enforceable if you want to challenge them. AKA call trading standards.
Source: https://www.gov.uk/guidance/unfair-terms-explained-for-businesses-full-guide#common-myths-about-contract-terms