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Dulux diamond
When I used to sub out decorating the guy I used hated this stuff with a passion because it couldn't be touched up. It all came down to a bad experience he had where an angsty project manager got him early to make things look further along than they were; the roof wasn't on when he started. He ended up having to repaint every room multiple times because someone would inevitably fuck it up.
Leyland trade is normally touted as the best value option by professionals. Dulux diamond trade is very durable but expensive, also has a slightly plastic finish.