A few further notes about this business about employers still retaining a route to compulsory retirement.
The terminology being used in employment law parlance is EJRA - employer-justified retirement age. Search it if you need more case law.
Here's some wording from ACAS guidance to employers on the matter; this is going to run and run:
"Employers who wish to use an EJRA need to consider the matter carefully.
They will need to ensure that the retirement age meets a legitimate aim, for
instance workforce planning (the need for business to recruit, retain and
provide promotion opportunities and effectively manage succession) or the
health and safety of individual employees, their colleagues and the general
public.
As well as establishing a legitimate aim an employer will also need to demonstrate that the compulsory retirement age is a proportionate means of
achieving that aim. The test of objective justification is not an easy one to pass and it will be necessary to provide evidence if challenged; assertions alone will not be enough.
When looking to establish an EJRA it can be helpful to first set out the reason why you wish to do so clearly on paper. Then ask yourself whether you have good evidence to support this reason and then finally consider if there is an alternative, less or non-discriminatory way of achieving the same result. Throughout, you should always remember that you need to show ‘objective’ justification not ‘subjective’ justification.
Having established an EJRA, any retirement of an employee as a result will
be considered as a dismissal for some other substantial reason."
No doubt we will hear of dismissals under EJRA being tested at ET for unfair dismissal in the weeks to come.