Seconds Out Gym, somewhere on Brunel Road, article says they have AED "You hope you never have to use it, but we want people working around the Gorse Lane area to know if they have a heart attack we have one on site." - may be indoors though so survey to see (and to add the missing gym - address is 10 Brunel Road so guessing where to locate this note). https://www.clactonandfrintongazette.co.uk/news/north_essex_news/19245343.clacton-gym-installs-life-saving-defibrillator/