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Water pressure can be fixed but it costs money to so. But if you need to re-do the heating and whatnot anyway you can get it addressed at the same time.
Boiler...just budget to have to replace it. You will anyway. It's just a matter of time. The thing I would look out for on it would be where it is actually is positioned, they type, and what it is plumbed in to.
Windows - if they are double glazed then in a pre-offer visit check for panels that have lost their seal. If they are wooden frames you can eyeball for rot on any visit.
As above, on a first visit, only things like massive cracks, obvious rot / damage, damp and mold are worth noting. You are more scoping out for fit with your desires and whether you could grow in to it and extend it in the future.
On a second, third, pre-offer visit then obviously running the taps, shower, opening windows, moving furniture and whatnot is more reasonable.
Cheers for the responses, @umop3pisdn & @Stonehedge. Water pressure is definitely something I'll check & I'll take a look at that list, ta!