This was Collins's last flight. She tells us that she always planned to stop after her fourth mission - to give others a chance to go to space.
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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.
"And even if they go elsewhere, it's always the most shows, or the best shows in London. So if you're Northern, it's not great."