It's about 175 miles from Bristol to Immingham (NE England ... completely off-topic, but the town where Lady Anne Smiley took one of her lovers in "Tinker, Tailor, Solder, Spy").

However, as described in this 2017 paper - [agupubs.onlinelibrary.wiley.com], could these mysterious hums be the result of continuous free oscillations of the Earth?

Hermione
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