Just for clarity - the Adnams mini-
casks (Bitter, Broadside, some specials) contain live yeast, but the mini-
kegs (Ghost Ship etc) do not - explained here :
https://www.adnams.co.uk/articles/mini-casks-and-mini-kegs-whats-the-difference.htm
Fullers Vintage are also bottle-conditioned, but people have struggled to get yeast out of them - high ABV is not ideal
Harvey's Imperial Stout contains Debaryomyces hansenii alongside the main Harveys production yeast (
http://www.beerhunter.com/documents/19133-001504.html) - the main yeast came from John Smiths on the 21:56 train on 14 October 1957 :
https://www.harveys.org.uk/news/60th-anniversary-harveys-yeast
DNA sequencing of one of their strains shows it's a relative of the saison yeasts, which presumably accounts for the slight phenolic character of Harveys.
The Marble yeast originated at Gales according to James Kemp :
https://protzonbeer.co.uk/features/2017/12/27/fuller-s-marble-revive-classic-old-ale and I've heard of people recovering yeast from Dobber in the past.
Hen's Tooth appears to have been discontinued.
It's Nøgne Ø - Tesco had their saison for a while not any more.
WLP540, allegedly from Rochefort, is a non-phenolic English strain so the Rochefort house yeast may be of interest for making English styles?
AIUI most (but not all) Sierra Nevada beers (at least bottles?) are bottle-conditioned, and I'm sure I've seen an interview that confirmed the Pale Ale uses the house strain for bottling.
Bell's tell you how to harvest their yeast!
https://www.bellsbeer.com/news/how-culture-bell-s-house-yeast-bottle-bell-s-beer
I asked the Sharps head brewer about their yeast origins and he was rather vague about it, but did mention they did come close to changing it a few years ago - it felt like they weren't too tied to it anyway.
There's some inspiration in the list of winners of CAMRA's bottle award, which I think is restricted to bottle-conditioned beers :
https://www.camra.org.uk/beer/awards/champion-bottled-beer-of-britain/
The Hanlons yeast is interesting (and CAMRA have given awards to Hanlon Stout) - at least if it's the same as Brewlab Devon1 then it's very banana-y.
Young's Bitter is also bottle-conditioned - is Marston conditioning all the Young's stuff now?
https://groceries.asda.com/product/bitter/youngs-bottle-conditioned-bitter/910000351280