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Hi Mark,
Sounds like an earthing issue, was common on the pre 2005 cars (E46 etc). The aerial wiring and demister wiring share the same location. As your car's a 58 plate it'd get it looked at under warranty.
the 20i petrol is an engine to avoid due to reliability issues. Don't know if your 18i is the same engine but detuned. This is the case for 20d and 18d respectively
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