Three large scale models of London to enjoy

Three large scale models of London that have usually been in three different buildings can currently be seen together in one room.
The largest of the three is the huge scale model of central London, covering roughly zones 1-3 on the travelcard, and is the one that many people will have seen at the Building Centre over the years, or more recently at temporary sites in King’s Cross and Stratford.There’s also a model that’s always been open to the public, but not many people knew