Can't help with a quote, but I do live in one of these houses (a "parlour" house). And I have a friend who also lives in one, where all the interior walls were taken down by the previous owner. And as you say there is still a partial wall separating the parlour and kitchen, presumably for support.
One thing I would say about this set up - although it is lovely, you do lose a lot of functional space as you lose walls to put furniture against. For example, I have two bookshelves and a TV cabinet against walls that don't exist in my friend's house. She has noticeably less storage in her house.
The other thing she has mentioned is that all the heat from downstairs escapes up the stairs, and any draft from the front door sweeps into the entire ground floor.
However moving your kitchen cabinets from the side of the room they are currently on to the "under the stairs" side may significantly change the functionality of your kitchen enough that you would no longer want to knock down the internal walls. I have the cabinets, with a peninsula unit, on that side and it works very well indeed. I also blocked up the back door, to allow a full run of cabinets, and replaced the window with patio doors (this is a common modification in these houses and you may already have this). If you want to PM me I can send you a link to some pictures.