OP
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Yes, good advice, this is on my radar. Pretty sure inlet its fully open, but will check, downstairs water flow from kitchen tap (near internal stopcock) looks pretty good, but not sure what 1.5 bar looks like and so may have to use the 1litre and timing trick to see (unless there is any other way to do it)?You are correct in that the higher power shower will make things worse IF all other things are equal.
As mentioned in one of the post above, there should be a filter i the inlet to the shower which may be a partly blocked, so this is the first thing to check.
If all is well there, then this is a plumbing problem, which can almost certainly be improved on, but not necessarily eliminated.
First thing to check is that the main stopcock to the property is turned fully on. It may have been turned partly off to control excessive flow from some taps. The problem taps should then be fitted with their own 'stopcock' (they already should be) which can be turned partly off.
If the water flow from copper pipe into shower looks good as well, then can only assume the shower or filter need sorting. If flow is good into shower, would prefer a 10.5kw shower as winter months are coming.