The best quality is "Crazy Horse Tailor" two doors from "The Wanch" pub. Don't worry about the name, he is good. He will also fit a beaut coloured lining to your uniform jacket. Go for two vents (fart flaps) it looks so much more elegant than one.
W W Chan outsources his tailoring to mainland China. Crazy Horse does not. There is a huge difference in the quality of the stitching.