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Pipe entering the monolith tank bottom right (blue collar) is likely to be the cold water inlet to the tank, if you follow this back, this is connected to the main house water feed.
At some point from the water inlet pipe there should be a connection to fill / top-up the radiator loop, valve might be one of those without a handle and operated with a flat head screwdriver (connection might temporarily disconnected and connected via a flexible hose?).
Although it might near the tank, it doesn’t have to be, it can be anywhere convenient where the central heating loop and cold water inlet to the house are in close proximity - it is however normally reasonably easy to access, as radiator systems do need to be emptied/filled/topped-up every so often.
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You need to add more water to the heating (radiator) loop to increase the loop pressure. There should be a top up valve somewhere. Quite where will depend on where the plumber installed it.
The “monolith” is the pressurised water tank, the boiler heats this in the same way it heats the radiators. There will also be a small electric immersion heater in there (probably what the two wires are going to under the grey cover).
Don’t mess with the small white pressure vessel, this is an expansion vessel, it doesn’t do anything with regard pressure in the radiator loop.
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Eurosport / Eurosport Player now appears to require a Discovery+ subscription. Annual cost usually £60 currently £30 until 20-Feb.
https://promo.discoveryplus.co.uk/promo/all-sports/watch-eurosport-on-discoveryplus
Excellent.
Probably best to add some of this at some point: https://www.screwfix.com/p/fernox-f1-protector-central-heating-inhibitor-500ml/342pp or similar from another brand.