Mr Plastic, prices are reasonable and they do white, mahogany, light oak & black, don't know if there's one near you, thay have 6 stores but will do a delivery.
Bought loads of stuff from them, very pleased so far, another one you could try & look at are the Asphaltic Roofing Supplies which my local now do all upvc products, I couldn't remember if they did brown colour though.
Asphaltic Roofing Supplies location, they have 51 stores all over the UK, my local would match the prices of Mr Plastic, maybe because they were opposite each other
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