The Sugar Reduction Summit will take place in London at The Royal Society, which is on Carlton House Terrace, just off Waterloo Place between Pall Mall and the Mall. The nearest tube station is Piccadilly Circus which is 5 minutes or Charing Cross mainline which is ten minutes.
The address is:
6-9 Carlton House Terrace
The Royal Society is centrally located near many hotels and is conveniently located for the Piccadilly and Bakerloo underground lines.
You can search for local hotels based on distance and price using www.laterooms.com. To do this, just add in the postcode for the Royal Society which is SW1Y 5AG