Smart clothes, not full suits, but smart trousers, shoes, and shirts with collars (men) and no strappy tops (women). If you can see "up it, down it, or through it", it's not acceptable.
Answered - Customer Service Advisor (Current Employee) - Southampton, Hampshire
Formal wear, if you like to change your hair colour keep it toned down rather than bright candy floss pink for example.
Formal attire, suit and tie
Answered - Head of Service Operations (Former Employee) - Southampton