WWW,
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Your point about RPI and pay increases is the big fish, if said deal goes through, the longer any staff remain in NAPs, the longer the watering down effect has to erode pension value, it will hurt all staff, as you say, staff with long years remaining will save most money for the company.
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The other changes can be worked out now, but the above change is a company master card, infact some would call it the joker, the company will have teams of bean counters using these cards to hugh effect.
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The company have played a very very cool hand!!!