This event has now finished. Until Dec 23 2010
Time Out says
The Mews is a working department of the royal household, responsible for all the road travel arrangements, by both traditional horse-drawn carriage and by car, for the Queen and other senior members of the royal family. The Queen's coaches, carriages, limousines and horses (Cleveland Bays and Windsor greys, each named personally by the Queen) are kept here, ready for the next royal outing. Opening times are subject to alteration at short notice so it's worth phoning before your visit.