Another firm NO to CPZ from me too. They are a contagion - get one and drivers look for parking further afield, then that area gets a CPZ and so on, until there's no uncontrolled parking at all for miles around. Meanwhile the Council's laughing at £120 per household.
Also thinking about the previous poster's mention of Zipcar - if you use Zipcar, can you transfer your respark permit to them? Or are they exempt? (they should be!)