water pressure not there in my taps and shower

it could be a few things that is causing your problem you could check your cold mains coming in which you will have to your kitchen sink on the cold side depending on what type of heating system you have depends on the pressure to the hot and cold to other outlets if you have a gravity feed system then the pressure will be different from your cold mains if you have a combi boiler or seal system then should be nearly the same pressure have a check if you can and it will give you more idea who to call out Regards Martin Edwards

This could be a few things, the fact you live in a flat means that you most likely share an incoming main which is then split per flat. I would firstly contact the local waterboard who you pay your bills to. If there is a leak in the road or a water problem in your area, those people will no about it. Failing this a comment plumber should remove a pipe from a valve under you sink and see what the pipework flow is like. Hope this helps