So, basically they're not particularly bothered whether you work to 70 or not, they just don't want to start paying your pension until you get to that age.

They're hoping that you'll get your own pension sorted out and finish work before, for example, 69 year old brain surgeons with shaky hands start making mistakes!

Which is fine if you're in the sort of job that pays enough to let you do that, but most people aren't.