not really mate, how many plastic header tanks do you have in the loft ? one or two ?
the way that pipe comes on the right hand, thats generally the primary flow from the boiler, which, in a gravity system would always rise from the boiler to prevent air lock, that one doesn't which kinda suggests fully pumped with a 3 way diverter valve, more so cos its run in 22mm pipe,
the pipe off the top is hot water draw off and vent which is always the same,