hi, you should be looking for a silver braided pipe which connects to 2 pipes on your system, looking at your pics you'll prob find them by the hot water cylinder. is it an unvented system??? if so there will be a red expansion vessel there and it is normally situated under there with a pressure gauge attached
you need to get up there and see what you've got around the installation but, before you do that normally, when they are in lofts the controls are installed in an easily reachable place on the lower floors, if you have an airing closet it'd be wise to check in there first
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