So it's been a month.
Front room ceiling
This has been an adventure to say the least. The issues of level became much more pronounced towards the other end of the room, and without levelling was heading for a very wonky ceiling, and finished reduced level of 2 inches or so from original joist!
I decided to find the lowest sitting joist and use that as my reference point, attaching a 2.4m beam into the joist ensuring it was level sideways across all other joists. This allowed me to place new battens parallel to the existing off joists and sort the levels out, smoothing out the joist drop towards other party wall.
To make the job easier (considering I have an entire house to do), I've invested in a lift which set me back £70, and makes the job a one man possibility.
Some idea of how I was levelling the joists
In the end, over a 5.2M span I ended up with 14mm deviation in floor to ceiling height, not sure if this is good or bad but I'm happy compared to what it was before.
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Front room flooring/walls
Basically all done, pretty level and no noticeable lippage between sheets, so feeling confident of laying engineered / laminate and not having any issues. I've maybe excessively battened some areas, but this does now mean the floor feels like it could take a tank and still be standing, there is 0 bounce or reverberations noticeable within the room.
Managed to fit the radiator, however need a re plaster for the bottom brackets as sods law dictated blown plaster exactly where my lower brackets need to go!
The walls are also done, just need to grab a few skim beads and get them on
Kitchen
This has now been stripped out, and actually fairly happy with the quality of the plaster that remains, very minimal to skim.
The floor however, is not going to be fun. A single joist is sitting 5mm above every other, so to avoid sistering every joist to match it, I'm going to plane the joist down with the hope that it solves the issue. The floor for some other reason has seen a major leak at some point, and the chipboard is rotted in some areas.
Plans for the kitchen stand as 70% tiled floor (down on schluter ditra), and 30% will be laminate or engineered wood, most likely transitioned with a schluter profile. We're also going for a fully tiled feature wall, in a very decorative porcelain which should complement the white kitchen nicely to stop it being overly cold (trying to get a sketchup done).
All of the plumbing will be moving, as well as any central heating. Will be plumbing in a semi-central island with wash basin, and on the stripped wall above plumbing in a new radiator, and removing the capped gas feed (teminating the other side of room) in preparation for a 90CM gas/electric induction