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Ok, if thats the case. Do the tests @rive_gauche suggests, and aee if thats solves anything. Then ask your neighbours either side of you if they have the same issues.
If can be your pipes in your house has a restriction so lead pipes over time will have deposits causing f&p reductions.
If no answers there ill get your water company to come out asap and say you have low pressure(s). They usually attend same day and will do a flow and pressure test on your side. If that returns low that could suggest an issue in the network. If you get to that stage then let me know. They will maybe do a service pipe relay. I dont think your in london so my local knowledge is limited otherwise i could dig a lil deeper for you
Is your pressure poor 24/7 or say during peak draw so anything between 6-9am and 7-10pm?