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"A lot of stately homes will have that system," says Niki Johnson, fire systems technical adviser for the UK Fire Association, a trade body, and owner of fire detection firm Derventio Fire and Security. "You could be looking at £3-4,000 just to do a corridor." Such installations require substantial pipework, he explains.
Disturbing images of her were being shared on the dark web - an encrypted corner of the internet only accessible using special software designed to make owners digitally untraceable.