Ours have never won an employment tribunal.
And I've never lost one.
Despite having been in HR for over twenty five years, I agree most HR departments are useless, specifically at the transactional stuff.
This is the reason I did interim work and consultancy for many years, so I didn't get stuck in some hapless HR team or caught up in politics.
But I've always preferred the employee relations and law side than the looking after people side.
I've just taken a perm job and am in the upper part of the salary range mentioned, as are all people at my level, no matter where in the country (I am not London). It's not overpaid it's an equivalent job to an accountant and at my level they get paid this sort of salary.
As someone else said, HR don't make the decisions about how many of what jobs to cut. What we do is advise how it can be done within the law, and policy if there is one.
But I also have to deal with HR, for my own stuff, and yes, they are pretty rubbish.