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That looks like a transformer. Sometimes the wires are caught up on insulation or something else!
I use a lot of the EVOFire large hole fittings to convert to GU10. They cover the surrounding plaster which is almost always damaged when you remove the existing ones.
https://www.downlights.co.uk/fire-rated-gu10-downlight-large-hole-integral-evofire.html
There are smaller ones available which you add a plate to. Last time I looked the large ones were harder to find as I think they are moving over to the normal + plate to cover the larger holes.
There is also a version for insulation. They're rated for fire and bathrooms.
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I got the new ipad pro that came out in the summer, pen and keyboard as well and it's been great. It's quite heavy with the keyboard case thing but still more versatile than a laptop for my use case. I had been using the 12.9 pro ipad since it was released and still use it although the big upgrade for me is face id. The keyboard trackpad is very good too. Pen if you use one is a massive upgrade on the early one as it now clips to the ipad and charges.
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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 have a couple of issues with integrated. Lamp quality, especially CRI values can be poor and when you need to replace one it might be years from now and the exact replacement won't be available.
If you get the holders and lamps separately you can choose to have a reasonable quality box of GU10 from Amazon for £15 or Phillips Master for £6 each.
If you have a dimmer on the circuit and you convert all the lamps to LED you will need to change the dimmer too.