So just to post an update here, I recently gave my car a full service including changing the air filter. The sounds is noticeably reduced... my suspicion is that either the old air filter was past its best or it wasn't secure properly perhaps leaving a small gap for air to leak.
The other things I changed, but I can't think of any reason it would cause the noise to change:
Brake pads
Brake fluid (flush)
Engine oil (flush)
Oil filter
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