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Yep, as above. Also if you have any neighbourhood forums, whatsapp, etc then it's surprising how many people will let you have a look around their loft and chat about how they found the builder.
The loft companies will probably also be able to put you in touch with a few people as well.
The first draft the architect from my all-in-one place came up with was terrible. I ended up sending them links to 3 or 4 approved ones of the planning portal and saying "do something like that" which they did.
I'm the opposite end of the scale from chrisbmx116 though and had no issues with a bog standard box being plonked on the roof.
Cheers. Found someone on the other end of our close, so will have a nose around and then maybe hit them up.
Will mos definitely have upvc windows.