A pension is part of the overall remuneration package though so it's not really a perk.
A mate of mine is a retired senior fire service officer and he reckons that firefighters (and I presume police officers) accept a more modest wage in return for a generous pension.
There's also the practical...
It would be foolish to badmouth my employer so I must say that the BT vision box is NOT utterly rubbish and is IN NO WAY a much inferior service to Sky; I am, in fact, considering going back to Sky, so that I can regularly espouse how rubbish it is compared to BT Vision.