I'm assuming that your wife either has a Trendline or Comfortline Polo, not a GTI. All models below the GTI have the not-so-fancy basic MFD which doesn't allow control of Bluetooth settings/phone book etc.
Because the car has the RCD 310, and no way of controlling Bluetooth directly through the MFD, then re-coding will be necessary to allow a Bury cradle to work. If you didn't want to code anything, then you can buy VW-branded Bury cradles through VW dealers and, while more expensive, they don't require coding, although I'm sure someone on this forum who has VCDS would be happy to help you code the Bury cradle.
Hope this helps.
Alex.
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