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@rhowe
If you have a combi and want higher flow or pressure using a pump then there are accumulators or something similarly named you can fit I think. A bit like a tank which is filled at mains rate but which you can empty at a higher rate. Not sure of the details but it might be like the expansion vessel in a boiler for closed heating systems? Sounds like just another thing to go wrong to me though.
An electric shower will let you run up to whatever your mains pressure & flow allow - might be an all-round simpler/cheaper option?