Just came in my Facebook news feed, never really heard of Charles Wilson as a clothing brand before so must be some paid BS. Stuff on the site looks pretty good though and £10 for 2 polo shirts delivered is a steal so might get 2 and see what they are like. At the very least they will make good dusters! ;)
The URL seems to add the code automatically cos when I got to my basket the code CWPOLO was already there.