Charles Tyrwhitt has an offer running currently where they are offering 4 shirts for £100.
If you add the coupon code during checkout, you can get £10 off the total price. The code is valid for all orders above £75, so you could also use it in case you just want to purchase one or two shirts.
International Shipping is £14.95.
CT offer quality shirts at a reasonable price. Can't personally vouch for it as this is my first purchase from them, but can confirm that the code works and $40 for a quality shirt delivered to your home, seems like a good deal.
i've been ordering their shirts for a while - 4 for 100 is pretty standard, but the coupon here is good.
their shirts are very good - i go the non-iron slim fit (the regular fit is very very big!). i prefer their shirts over tmlewin.
but the really annoying thing is that they now no longer deduct the vat - which they used to do. so effectively they charge a higher price for international customers, PLUS delivery. annoying, but doesn't stop me buying.