A few months ago I noticed what I can only describe as an electronic grinding noise coming from the car's engine area. It has absolutely no effect on the engine's performance, and seems to happen at random. A mechanic at a local Vauxhall dealer heard it, took the car in, and couldn't replicate the noise. I have worked out that it's not coming from the engine, because the noise occurs when the engine is off but the ignition is on. I finally managed to get a recording of it here (ignore the passing cars): https://youtu.be/U-3sIeS3L-o
Any idea what it might be? As I said, the performance of the car is completely unaffected, and it seems to happen at random. I'd be grateful for any advice, as I currently have no idea whether it's important or not!
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