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Bought a briston shower for my old house. Gravity fed system based on the published specification indicating a reasonable static head. Apparently they were an order of magnitude out so had zero flow. be careful what you buy off them. Took me months to resolve with bristan as I'd obviously installed it before finding out.
Sample size of 1 but I installed a Bristan tap at home about a year ago and both indices have now fallen off. V disappointed given the pricing.