Problem with flow rate upstairs only

Hi Could I ask for some help with a water flow rate problem.

I have good mains water pressure on the ground floor. There is no tank in the loft but an unvented cylinder in the upstairs airing cupboard. A gas heat only boiler.

Upstairs I have two en suite rooms. One with a shower and one with a bath. Basin sinks in both rooms.

The cold flow rate is very poor in both rooms whether shower/bath/basin taps. Sometimes nothing comes out. The hot is good for about 30 seconds and then it drops to almost nothing in the shower/bath and basin taps. You cannot have a shower or bath at the current rate.

I've checked all the stop cocks and they are all fully open. There is a pressure top up in the airing cupboard and its at 1.5 bar.

As the flow rate is good downstairs and the system runs off the mains it seems the problem is inside the house. Anyone have any suggestions on what I else I should check or suggestions for the problem? Thanks.

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