To answer your questions
@Leon103
Keeping the beer cold is a problem yes, although I am planning on bottling and sharing quite a few with friends and family, and the rest will get drunk quite quickly I imagine. Some beers are better slightly warmer I guess as well, the fridge can turn off the flavour. I would like a kegerator setup but at the moment they're just too expensive.
I am getting a CO2 bottle and a tapcooler or similar - assuming members of the public can buy gas bottles? I know I can get propane gas ones (not suitable I know) because my last house ran on them. They were stored round the back.
I understand about opening the bottom bottle and letting the oxygen in. It was my understanding that I could release the pressure, then close the butterfly valve, put my hops in and then blow CO2 across the bottle before opening the valve again (this is why I bought 3 carbonation caps instead of 2).
I have a heat belt and inkbird on my list so like I say until I get a decent fridge I can only really control temperature upwards. I did source a fridge on gumtree yesterday but they are messing me about so they can shove off lol. I think i'd be better off with a larder type one anyway.
I haven't tried any kveik yet nope (or beers) so I haven't a clue about that. I have learned though that the ones with the bacteria are probably the ones you're on about so I will avoid those.
It's all a learning curve and if something doesn't work, I will tweak it for next time. Experimenting and finding things out is half the fun.
Thanks for the advice. ☺