CT are good shirts, but do keep in mind that their collars are fused and somewhat stiff (per my taste). Their collar points are also quite short on the spread collars, which makes it difficult to match them to some suit jackets (collar gap).
My choice for shirts is TM Lewin http://www.tmlewin.co.uk - usually good deals for buying 4 or more shirts. Their collars and cuffs are unfused, so they fit more naturally and stay in good shape after many washes (some of my TML shirts are 3+ years old with regular wear, and they still look good).
Hope it helps.
Can you get Kamakura shirts in the UK? They are pricier, but very nice. They have unfused collars and cuffs. They also have longer collar points.