bbenbeta sorry for double post - was on mobile!
To be honest I'm not particularly exercised by whether public sector salaries are artificially suppressed and a more generous pension is the other side of the coin. I work in central govt for a comfortable amount of money, and I will definitely be affected by the pension contributions cap, also by the CB cut and so on. I do just twitch a bit at being taxed twice on the same money. And this threshold is pretty arbitrary - my scheme is 3% employee 6% employer contribs; at a salary of 34k you will start getting taxed - that's a whole 10k away from being into higher rate tax, usually the measure of whether you're "well paid".
My point about the 1:10 and 1:16 ratio is that it is one of the ways that public sector pensions are being looked at - accrued benefits to date can't be taken away, but the pension/annuity purchasing power of the same contribution I make next year won't be as good as this year's.
Taxing the public sector's pension contributions at 1.6 times more than private pensions looks to me like a clear way of raising revenue upfront as you say they need to do. Again, I just twitch and think how this is a few hundred thousand middle income workers bearing what feels like a heavier burden than the family next door - lots of little hurts in payslips, when the same amount of money could be raised by one big eyecatching thing like the corporate rate, or the big debtors like Vodafone. I don't have an answer here, and I don't know the details well enough to pronounce. If I worked in HMRC I'd be getting stuck right in, I find it hugely interesting.
The other important point about public sector pensions is that they are not pension funds; they are not invested and at risk on stock markets, but paid out of current taxation (like state pensions). Therefore the big glut of these pensions follows the demographic curve of how many public sector employees are retiring. The government needs to be able to allow public sector retirees to cash in their whole pension at age 60/65 and choose to use it as they want, or take the longer term payments from retiring to death. The pension gap therefore is just starting to open up as the baby boomers retire. I don't know how the size of state employment fluctuated in the 60s, 70s, 80s, but I think the 90s and 00s saw a significant rise particularly in central government. Making big cuts in public sector workers AND a tax penalty on them putting too much into their nice government pensions will store up a good dividend to a government decades from now.