Strange loud "barking" or "sneezing" sound

This is potentially water hammer due to loose pipes, attempt to source where the main sound is coming from and identify if the pipework is loose. Clip or support the pipework in place and run the taps on and off to see if this resolves the problem. Alternatively it maybe air in the system, run all the taps in your house in order to free the air from your system. I hope this resolves your situation .

This may happen do to different reasons could be the pressure or the valve if there is any and sometimes it may be just the cartage on tap need to be change. Must be checked to determine what's the reason

water hammer ,uncliped pipes, ball valve judder, worn ceramic discs in taps,clip any uncliped pipework,fit equilibrium fill valves to toilets and cold water storage tanks, turn down water pressure or fit pressure control valve, or fit water hammer arresters as near to the sound as is possible , you may need to check other flats for source of noise .