Misc: On This Day In January 1861 - ______ seceded from the United States.?

Questions

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?

What area of London is bounded by Oxford St, Charing Cross Rd, Coventry St and Regent St?