Since removing all pipes from our loft storage tank in order to replace the deck it was on and had soaked, I've successfully reconnected everything and fixed the leak in the tank. But now the water pressure from cold water taps upstairs is much less than it used to be.
Could there be a bubble in the pipes now? Do I need to flush that out somehow?
I should add, for the troubleshooters, that the tank is in exactly the same place as before, with the same pipes (unmodified) and as high as it was before. I replaced the boards that made the "deck" and reconnected the same pipes. The tank is as full as it was before (a lot of water in there).