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Sure, here you go:

Okay, that makes sense. I'm not sure how else I can let air out of the system then, other than via the radiators :-(

Ah, ok :) There is also a similar looking vent attached to one of the pipes coming out the top of my boiler. Is that for letting out air? As it's downstairs, I would guess not!

Pardon my ignorance, but what might that look like? The only thing that looks like it might let something out is attached to a pipe that comes out the bottom of the hot water tank.

The pump runs constantly whenever the heating or hot water is turned on. The only valve I am aware of is the aforementioned British Gas MV22M, but I can't seem to find any information about that model and I'm not entirely sure how to check whether it works. If anything needs to be taken...

I'm confused now, as the central heating suddenly started working when I tested it this morning, successfully heating every radiator in the house. Then I turned on the hot water for a bit and that started to warm up. I turned them off around midday as it was getting quite warm indoors. I bled...

Should I do that while the heating is on or off?

Both tanks in the loft have water in them. The smaller one is the expansion tank, I believe, and the water level is above the exit pipe.

As it's starting to get colder, I decided to test my central heating this weekend. Unfortunately it didn't work, and now the hot water has also stopped working! I have an Ideal FF260 boiler downstairs, which leads upstairs to an electric pump. The pump feeds to a British Gas MV22M three-way...