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Detection of the key being present in the steering lock, I think, may control more than just the radio. "Safe lock" activation, if fitted, may be one - on mine, the safe lock text flashes on the display on key removal.

If there are other things controlled by key presence, and if they also fail, then the lock theory might right, but it's a bit of a coincidence that it failed at the time the car was serviced. If you have stop-start the new main battery would need to have been coded into the ECU, but that may be unrelated. Try disconnecting and reconnecting the main battery with the key in the lock.
 

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A new battery will mean your stop-start works, no matter what. The coding thing is about giving the ECU a hint about how well your battery is likely to perform, for stop-start puposes, given some profile data about the battery, and it may affect how the smart alternator chooses how much to charge it up. It may be marginal; it's hard to know for sure!
 

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Cars with stop-start may need to have the coding from their new batteries entered into the ECU - since there are two people with the same radio problem following a battery change, this may not be far-fetched!

In any case, we are waiting to see if the other member has had any success with their radio, by disconnecting/reconnecting the battery to force a reset (etc etc)
 
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