Acoustic early warning systems, spectacular remnants of a dead-end technology on the British coast
Various other things of interest, including modern sound mirrors and similar technologies.
Jodrell Bank have a pair of acoustic mirrors, similar to the marshmallows; perhaps you might include them on your “others” list.
Number 5 on the site map at http://www.jodrellbank.net/visit/plan-a-visit/site-map-and-information/
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