I don't do fast fashion and I try to buy British, but the last thing I bought from a British company (Celtic and co) has in the label, made in Thailand. So much for buying British eh. I've had other stuff from them and that too is often "made in Pakistan" or India or Thailand.
As for kitchens and bathrooms, I'm a once and done for 30 years so I choose carefully, but still my bathroom tiles were from India iirc, God knows where my kitchen came from. Do b and q make kitchens in the UK?
White goods in my house are only changed when broken, but sadly not much lasts anymore. I'm pretty sure my mom had a washing machine for 20 plus years, I can maybe get 3 years out of mine. Same with fridge, my mom had a fridge freezer for my entire childhood, it moved house many times and continents, my last fridge was 8 when it went and was repairable but you know once you've repaired some part, within weeks another part will go. Cheaper to buy new.
It's very easy to say buy less, buy British, but I cant help manufacturers make better quality gear or make supposedly British garment makers make stuff in Britain.
Plus money, my boots often cost £300 and last years and years, I've not always had that kind of money so its been £8 boots or £7 trainers or £2 sandals to get me through. But £8 boots dont last you past one winter. And for damn sure £8 boots are not made in the UK.