Noises from Water Cylinder or Booster Pump?

Hi Hope you are well. I started to get a very loud noise when opening the shower tap and flushing the toilet. It sounds it come from the water cylinder but I'm not sure perhaps it's actually the pump that started having issues recently. Here is a link to the video where you can hear the noise: https://share.zight.com/7Ku9WNge Not sure what is current fix or problem, I'm open to hear prices for fixes and also replacements (Heard about different options such as unvented cylinder, boilers, etc). Best, Zach Video of the issue: https://share.zight.com/7Ku9WNge