I have fitted mixer tap in kitchen and bathroom sink however water presure is very poor almost non existent. Bath is fine and tank leads to that first

Graham, February 2009

You have probably fitted high pressure tap instead of low pressure. Bath taps are probably 22mm full bore pipe to the taps. Basin goes from 22mm to 15mm and now you've fitted mixer taps probably 6 or 8mm which massively restricts the flow. If it's tank fed you could fit a pump or put up with it or fit low pressure taps.

Jock, February 2009