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Sorry, wasn't clear. Increasing the size of the water pipe to the main stop cock in the flat from the main. Pipe work in flat to be altered so that the diameter is all the same. Currently the pipes seem to be a mixture of 15mm and 22mm with either compression joints or badly soldered joints on the pipe to the kitchen tap main tap and the boiler.
lynx
Increasing the size of water pipe from mains to the boiler and/or hot water tank is a good idea. It is also good to increase the size of the first branch(es) of the hot water towards shower or bath. Increasing other pipes may take some of the flow from the shower/bath. On all hot water runs you need to consider how much water sits in the pipe. 25mm plastic holds about 2.25 times as much as 15mm copper so it takes longer for hot water to reach your tap and more heat is wasted sitting in the pipework once the tap is turned off.