Where to get sustainable fabrics?

Hi friends!

I’m not sure if I’m posting in the right place but I have wanted to start making my own clothing for a while and my mum is teaching me to sew! I was wondering if anyone knew the best places online that ship to UK/NI for deadstock fabric that isn’t just polyester? I feel like a lot of the sites I look at online only have polyester deadstock and I would rather purchase fabrics that are more sustainable and even biodegradable where possible.

Thank you guys! I’m looking forward to sharing my progress with everyone 🥰