What do you get for the child who already has everything?
If you've got a lot of disposable income, you might want to buy your offspring a remote controlled speedboat so they can water-ski by themselves, for the measly price of £10,900. Or if that's a bit too pricey, how about their own inflatable water park for just £5,100?
If they're not big on the whole aquatic thing, you could always spring for the £67,000 robotic triceratops, or a £900,000 Mech Warrior that shoots 6,000 BB pellets per minute.