Cod - word of advice for you....if you take her to the Zara shop (intersection of Bond Street), be sure you wander upstairs to look at the children's department. The girls clothes are fantastic, and well priced....and I assume it would be the same for the boy's clothes. As you said previously - no skulls!
Also, though the image of the store isn't brilliant at the moment, it's worth spending some time at the Marks & Spencer Marble Arch. It's huge and got the best of what the store has to offer.
If your budget isn't crazy tight, might be worth the splurge of a taxi ride to Sloane Square if you decide to venture down the King's Road.