If it's a well done present and not anything that would break the bank but you want it to be thoughtful then I would suggest going to Harvey Nicks or Brown Thomas and buying her a jar of creme de la mer (euro 225 for the 60ml, euro 125 for the 30ml) and the exfoiliater (100 euro). Yes being a bloke you won't understand the concept of paying that much for moisturisers but I can tell you now she will be delighted.
If you want to buy her something else, a designer handbag is always a winner as are designer shades.