Brad Pitt was solo today when he touched down at the London Polo Club in a helicopter. He arrived back in the English capital, where his family has been based for the last week. Production on Brad's movie World War Z has moved all around Europe this Summer, starting in Malta before moving on to England and Scotland. Angelina Jolie has spent the last few days in the city with their six little ones — Angelina organized a garden party for Pax, Maddox, Shiloh, Vivienne, Knox, and Zahara this afternoon, which included races, jugglers, and more! There have been lots of treats for the children this Summer. Brad even bought his kids Shetland ponies, according to reports, which will be housed at their chateau in France.