They will be:Valve looks to be in the CH pipe not HW.
There seems to be about 5 or 6 pipes coming from the boiler to that cupboard
Cold feed from small tank (feed and expansion) in loft
Vent pipe to small tank
CH feed
CH return
HW feed
HW return.
The HW pipes should go directly to the boiler with nothing else (pump/valve) in the way
The CH pipes should connect via the valve and the pump.