Degas and Constable and McTaggart: this week’s best UK exhibitions

A plaster cast of the original Little Dancer comes to London, while two sombre masterpieces of English and Scottish art are shown togetherStatues of the Little Dancer – such as the one in the Tate Modern – were made after the death of the great French artist, based on a wax sculpture he worked and reworked over many years. Now, what appears to be a plaster cast of the original – as first exhibited at the impressionist exhibition in Paris, 1881 – has resurfaced. This dance