10PER
Charles Tyrwhitt is currently doing a 10% off promotion when you use coupon code 10PER. It's supposed to be site-wide, although I have difficulty applying it to their $39.50 shirts, although works well with their 4 shirts for $199 promo.
Here's the terms and conditions:
The 10% off offer can only be used once in a single order. Offer not valid in conjunction with other vouchers and special offers. Order through our website entering your offer code into your basket, or quote your offer code when ordering over the phone.
$12.95 Standard Airmail postage.
so 4 shirts become $179, each $44.75
not for me, after get my TMLewin each $36, thats the max im willing to pay for UK shirts