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Did they ever tell you what the mains pressure was?
How many storeys is your block?
Reason I asked about a sprinkler system is that you would normally be given a 90mm to your building and hopefully have a storage system for the system to operate from and then with that it could be a shared storage system to provide you a gravity feedTh average person uses 110-130lpd.
But before we enter into a somewhat soggy version of MAD, the water pressure is always the same, it doesn't get better or worse around the times the neighbours are preparing to leave the house etc.
I did have the water board look into it, their verdict was 'properties of this size should have a main supply pump, but you don't, so you can't expect to have good water pressure'.
I'd fit a pump in a second (they're £250 from Screwfix) if I didn't worry that I'd nuke the neighbours supply. Although with that said, I'm not hugely friendly with our neighbours. Hmmm.