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Not that easy to tell from a picture but that valve is likely the mains cold water supply which then runs through a Pressure Relief Valve to the hot water tank and the cold water supply. This mechanism balances the output of the cold supply and hot supply so that thermostatic valves etc. work properly.
It is in practical position for a plumber if he needs to change the Pressure Relief Valve as they can fail shut and reduce the pressure to the whole hot water system but not the central heating loop. It is very unlikely it has any bearing on your radiator pressure.
As others have mentioned you need to find a point where the cold water supply is connected to the central heating loop. The pressure of that loop is the reading you are seeing on your boiler. Occasionally these are in really stupid locations and very rarely the flexible pipe is missing or disconnected (good practice is to disconnect it when not in use but 99% of systems I see are always connected).
It doesn't look like your boiler has an internal filling loop and I can't see anything in your pictures that looks like one either. Google flexible filling loop to see what they look like.
Your system boiler and Megaflo is probably the best solution for the number of bathrooms and occupants but it's the smallest size of system that would need one i.e. they are more useful in larger households where there can be multiple demands for hot water. Unless the space is worth a lot of money I would stick with this system.
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The Tanos/Systainer stuff has it's frustrations. As you get more of them there's quite a lot of air around the tools so each tool starts to take up more and more space. The rolling capacity is great in a big workshop with flat floors but not so useful in victorian homes. The new style locks are much easier than the old one which can get very sticky. When you use a lot of tools for a job you need somewhere to store lots of empty systainers and when you come to put the tools away you have to deal with all the boxes.
It's a system that appeals to the brain on the surface and over 20 years I've forgotten how it is to not have the boxes to deal with. It does work well for transportation and the tools stay in good condition longer.
Their carpentry organiser has worked for me for many years but I replaced it onsite with a bag because it's awkward to fit into some workspaces and a small bag works much better.
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I've DM'd you a link.