i have recently tried to install a new basin and mixer tap in my bedroom, i have placed isolater valves on the hot/cold pipes and used flexi-pipes from the valves to the mixer tap but the problem is the hot tap has a very poor flow but the cold tap is fine with no issues, the water flow coming out of the isolator valve is no problem and the same with just the flexi-pipe but as soon as i connect it to the mixer tap the water flow just slows right down (on the hot). any advice???