Fair enough, the 50% reduction on anything over £20k seems a good one in theory, I'm certainly with you regarding the sliding scale, percentage increases have helped create this divide between the low paid and higher paid, I really can't understand how percentage increases were ever allowed to occur in the first instance.
With regard to pensions, I've already stated that I would happily reduce my lump sum upon retirement by half, my monthly cheque isn't so mighty though!