We have a local fibre glassing business (marine work mainly) that makes them in various colours, expensive though particularly with shipping costs, but maybe there's a fibre glassing business close to you that does similar?

I’m looking at getting a blind from there at the mo - I can recommend their free sample service - they deliver really quickly! I’m also looking at greys and it’s definitely better to see them in the flesh.

It really depends on what colour and fabric you have in mind. You could go for orange but it's a bit obvious. Is it for winter or summer? Do you like wool or would you prefer cotton, linen or a blend? A deep green might work or a stony neutral. Budget wise there is so much choice it depends on how often you wish to replace it and whether quality is important. Ikea has some nice ones at the moment (seasonal) as does H&M and Marks and Spencer. I have summer and winter throws.

Your house seemed to have been stripped of its victorian charm. You might find this interesting https://www.houseandgarden.co.uk/article/before-and-after-exterior-makeover-london-terrace