Sorry, no codes etc. When I've compared prices (it was online for the UK) using gold membership number, and then no membership, the no membership was cheaper (although I couldn't get the insurance yes/nos to match exactly).
There is a FT thread on this suggest you look at. There was a magazine one (CAR and Driver?) that has proven useful to me in the past as has the Amex Plat one but diont know the latest.
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