Where’s the best place to buy upholstery fabrics?

I’m looking for a very specific colour fabric for an armchair, but I’ve been disappointed with the quality of samples I’ve ordered from online shops. Can anyone recommend any physical shops for upholstery fabrics? Bonus points if near here, but anywhere in London will do.

There is one in Lewisham which I think is a bit or a local Mecca… Rolls & Rems

Try Designer Drapes in Penge High Street.