In reply to Slackboot:
> Am I right in thinking that given you can't be forced to retire on age grounds you just keep working (if you want to) until at some point you are made redundant?
You can just keep working. It's all about negotiating with your employer.
If you're just doing the day job and there's no benefit to them keeping you on, younger staff are cheaper etc, they may offer you redundancy; otherwise make your retirement decision based on your personal circumstances.
However if you're useful, and if they have no backup for what you do when you leave/retire, you're in a good position, and should have lots of freedom to decide what you want to do; go part-time and progressively reduce your hours, zero hours contract, and so on.
For younger people, this should be a key issue in considering career choices: make yourself indispensable (while avoiding having to work 8 days a week clearly).