The artist Yoko Ono, who turned 91 in February, has enjoyed a successful—if notorious—career over seven decades. She spent the seventies as the wife of Beatle John Lennon until his assassination in New York in 1980, and appropriately for British audiences, that part of her life forms the core of her current exhibition, ‘Music of the Mind’ at Tate Modern.

On the Aldermanbury side of Guildhall, you will find the London Centre, the base for New London Architecture and home to its magnificent London models. These 3D scale models of the capital and its buildings are a great resource if people want to see the architecture of London or the historical development of the city—or simply want to trace routes across the metropolis. Their sheer size is jaw-dropping.

Dates on the calendar we normally use have mainly Christian origin but some of them reflect pagan origins and everything changed in the eighteenth century with the adoption of a new calendar.