WHAT YEAR: Double helix structure of DNA discovered by F Crick & J watson?

Questions

Which company of architects designed the Millennium Dome?

Which track in Hyde Park is thought to be a coruption of the french route du roi?

What is the name of the 22 storey Canning Town tower block that collapsed in 1968?

London, to whom is the Cross at Charing Cross a memorial?

What is the address of the Sherlock Holmes museum in London?