People love the British Museum for different reasons – my husband loves the mummy collection, others crowd around the Rosetta stone or (a part) of the Babylon wall but I love it for an entirely different reason. There’s nothing like sitting inside the great court when the weather is good.
The collection is massive and the hoards of people equally so – my recommendation is to take a walking tour. There’s nothing like a guide taking you through the highlights in the most painless way possible. You can easily go back to the places that you want to dive in deeper after the tour.