A business dismissing a worker who can wfh but the employer is refusing to let them, especially where the employee or a member of their household is vulnerable, may find themselves on a sticky wicket
That’s a very difficult thing for an employee to prove, and a very easy thing for an employer. They can talk about ability to manage, overall performance levels, even the benefits of a team working together. An employee will have to disprove the overall benefits.
Irrelevant though, you’re on here swinging your arms about shouting about how you’re going to sue, how you will be encourage everyone else to sue, when if you’re personally shielded, then you will likely be protected.
As a pp said, that’s not your family who is also protected, and it’s not vulnerable as per your own definition of vulnerable it’s you who hast to be shielded. If you can’t do the job in the location required, which is often even in the employment contract, then the employer can move to capability termination.
So if your employer refuses to let you work from home. You’re going to sue them after they fire you? Or maybe you mean you’d take them to an employment tribunal for unfair dismissal?
I’d start right now gathering data on the overall team performance, management ability with a remote team etc, so you can prove the company should have permitted it, because this is likely going to come to pass sooner rather than later.
Good luck.