I bought one shirt from TM Lewin but wasn't completely happy with the quality, and the fit of the slim wasn't slim at all! Returned it and bought some 'tailored' (extra slim) shirts from Charles Tyrwhitt and am much happier.
Sometimes M&S, and Debenhams for cheaper shirts.
).Lads,
Where do you buy your formal shirts from? mine are becoming outdated and boring and need a new work wardrobe.
TM Lewin get my vote.