with lining paper i start at top and work down hanging it horizontal......i also leave a 1/4 inch overlap in corner with the butt lap cut into corner to cover overlap below it...........i decorated my livingroom 30 years ago and done 2 layers of lining paper....first layer i hung vertically and 2nd horizontally ......the wallpaper on top came from jenners and was very expensive but worth it......had 30 years use from it and it will get another 30 yrs use :)) .......you may see a bit of it on one of my clips on my channel - its a red damask design.

Really interested in your journey. Im an Aussie expat, long term resident of Phnom Penh Cambodia. I'm just back from a month revisiting Scotland. I lived in Stirling in the early 80s and still miss it in some ways. Looking forward to following your progress.

Don’t think that tank in the attic is in use as you have a combi boiler and they don’t require them

I would have re-rendered it but it's your budget not mine interesting progress no less :) keep it up :)