I have now identified the source of my mystery sound!


It was being caused by my Heko clip in wind deflectors.

I removed them as an experiment and hey presto, the sound was gone!

My wallet sighed with relief when I found the cause. :)
 
***UPDATE***

I was wrong. The mysterious sound was NOT being caused by the wind deflectors.
It was caused by my radio aerial.

With no wind deflectors on, I started my journey home from work but before I did, I moved the aerial so instead of being at a 45 degree angle, it was straight up.

I could hear the sound again, so remembering I had moved the aerial, I stopped and moved it back to a 45 degree angle and drove the remaining 18 miles home.

Not a sausage, no mysterious sound.

So, it was the aerial at fault. Luckily, no big repair bill for me this time! :)
 

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