How do I prevent

You`re plumbing is suffering from water hammer.Basically its the sudden stop of water in the pipes when the ball valve in the loft and the ball valve in the toilet lifts fully up and suddenly stops the water.The water pressure backs up and causes vibration for just a split second and any loose pipework will vibrate and make funny noises.Two solutions,slightly close your incoming water stop cock so the velocity of water is not as great and secondly you can clip and support any loose pipework.There is one third alternative,you might be able to change the ballvalves plastic orifice which is seated inside the body of the valves.There are high pressure and low pressure plastic orifice water pressure reducers

you need to replace washers on the ball valve and cistern ball valve try turning pressure up or down on stop tap aswell

Hi, i think if this was my pipe work,i would check all pipe work is fix back so very little movement, also bleed any air from system and lagged pipes, also check all valves work as they should hope of some help rigsby.

Turning your incoming water flow via stopcock down to half under the sink may help the situation.....

Hi there,you could try a pressure reducing valve on your incoming mains.also check that your pipework is properly supported & clipped...Brian