Strange water behaviour

[geppetto]

For some reason my mains water supply pressure has started pulsating at about the same rate as a heartbeat at rest.
The flow dips and rises to this regular rhythm

I've been out and tweaked the service tap and that alters the flow but not the pulsing. Also the stop cock (which is fairly new) doesn't alter the pulsating wherever it's set..

It's got me baffled, could it be a problem in the water mains beyond my house ?
Neighbour isn't in so I can't ask if his is the same...

Any ideas guys
Thanks
Regards
Philip

 

[geppetto]

False alarm guys...
My neighbour just got back and his water pressure is doing the same thing so I assume the hamster in the wheel at the local pumping station has developed a limp or something