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Hi yes this is a problem you will not be able to resolve im afraid.
Its about flow rates rather than pressure, and with the small pipe work feeding the hot and cold system you will never be able to get the quantity of water required to make this tap work properly.
This is the same for a lot of people who fit combi boilers and it takes ages to fill a bath. but the shower is fantastic.
The shower has small holes so the pressure coming out makes it feel and look good. the bath requires big holes to get a large quantity of water through.
The tap you have is a waterfall tap with a broad spout this decreases the pressure and requires more flow.
Has the pressure in the kitchen tap changed?
You are saying about your combi boiler, so is it just the hot that is affected? If yes then you may have a partially blocked plate heat exchanger but it wont be anything to do with the new bathroom.
If its hot and cold pressure it has nothing to do with the boiler and you should be checking your main stopcock is fully open and not stuck giving the impression that it's open.
If it's just hot and all valves are open then you will need to call someone in who repairs boilers they will be equipped to check pressure difference between hot and cold. Your boiler pressure is just for heating please leave this at about 1.2 bar Cold or 1.6 hot or you could cause more problems.
Ok so cold is good everywhere except basin. This indicates that tap has a problem. Could be due to the wide spout.
The rest is poor hot flow which indicates boiler plate heat exchanger or a restriction in the valve under the combi that turns off hot supply
Ok no problem