Not all adjustments are automatically “reasonable”. It depends to some extent on the resources of the employing organisation to fulfil them. For example, would they realistically have anyone else who could fix the paper jams without their existing duties being compromised, or is it likely they would have to hire somebody, just for that? It would be disproportionately expensive to do this, and besides it would be a difficult one to advertise, because you couldn’t really make a proper, worthwhile job, out of just the bits you’d rather not do. Would they pay someone just to sit around and file their nails until the printer jams?
If you happened to be local to me (Bristol area!) I’d probably agree to do it, and for minimum wage, or thereabouts, because I don’t want a lot of stress or hassle any more, and fixing the odd paper jam would be just fine (I once spent a whole Summer at a client site, doing little more than that, and reloading a couple of mag tapes - they still had those - and remembering to set the security alarm before leaving).
But anyway, wishful thinking, as I’m sure you won’t be in Bristol. A pity, as you probably won’t get many people saying: “Yeah, I’d fix printer jams for peanuts!”, and it could be the solution to your problem.
But there really is no automatic definition of “reasonableness”. It has to be reasonable for them, as well as you, and if they’re a small organisation, who would probably have to hire someone specially, to achieve what you’re requesting, it won’t necessarily be “reasonable”. The same with the “quiet area”. Have they actually got a quiet area you could use, or would they have to create one specially? Again, if it’s a small office, with not a lot of scope for rearrangement, that might or might not be practical. They can’t really be expected to give you a “quiet area” if there’s nowhere on the premises suited to that.
So the answer, unfortunately is, “it all depends”. If there’s a quiet area nobody is using, it does seem unreasonable you shouldn’t have at least occasional use of it. However, if there’s no such facility, the law does not require them to go to unlimited lengths to create one.