I believe that 'flow' is what is required. Not pressure. If it's coming from a tank in the loft then flow it is.
I have a rural customer that gets her water from a tank that sits atop a spring. It's a long story and an even longer run to the house. Anyway that aside, she has two large storage tanks in the loft that are filled from said spring by a pump. The water to the tanks is uv treated and screened for debris. These two tanks have a link pipe to even out the load if you like. In the ten + years that I have known the premises the link pipe - 22mm iirc has blocked twice. Only soft stuff that has evaded the filters, but it has caused back up in the lead tank and causes issues in the house via the ceilings and the downstairs light fittings!! I cannot quite recall the set up as it hasn't happened for the previous four/five years, but my point is that a small constriction can soon become a collecting point for more detritus and block or restrict the flow. When one gets one's hand on the guilt party as I had done from the very short link pipe, it's hard to believe that something that turns out to be so soft and innocuous can cause such grief. If yours is in a long pipe run then you may likely never know what it was/is.
Turn off the supply. Cut the pipe in an appropriate spot and force air down the line. Repair pipe.
Another old trick when a low pressure hot pipe was blocked and if you had separate hot and cold taps in the kitchen was to link a short piece of hosepipe from the mains tap and 'shoot' it up the hot pipe. It usually worked. If you cuff it up let me know and I'll change me Moniker. Good luck.
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