I calmly explained that it probably was an earthquake tremor, having experienced one a year or two earlier in the middle of the night (of wardrobe shaking proportions). Although I only noticed the plant shaking and a cracking noise from the conservatory frame, like we get in gale force winds, she had felt her chair tremble and a strange rumble sound.
The wonderful thing about the Internet is the instant data availability, so later, after a morning walk, I inspected the British Geological Survey site
and Lo!!
It seems the tremor was very local - 1.7 on the Richter Scale.
Co-ordinates from table above
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