I heard from someone that you can claim a part of your rent costs as an expense if you're working from home.
I work 100% from home and live in a flatshare with other people. I pay rent for my room £800/month.
From what I see here: https://www.gov.uk/simpler-income-tax-simplified-expenses/working-from-home it seems to me that those are the costs for utilities only. My utilities are included in the rent.
How much % can I claim from my rent costs?