The tap on the left looks like it has a non-return valve right at the top of the photo, so I'd say you're most likely correct, would just like to see where it's going to/from to be sure.Are either of the two valves in the second picture fully closed?
One of them is likely the feed into the bottom of the hot water cylinder. If both are open, close them one at a time and see which stops the flow from a nearby hot tap.
If the other doesn't seem to affect flow to any other taps, and you can't see where it is going to/from, it may be the filling loop. Close it when the heating system is cold. Then run the heating for a while and see does the pressure rise as the water heats up.
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