While at sea, guests heard talks and panels from Steve Forbes, fund managers Hilary Kramer, John Buckingham and Joe Battipaglia, and longtime Forbes columnists David Dreman and Ken Fisher.
Among the signatories are Conservative Zac Goldsmith, Labour MPs Mary Macleod, Seema Malhotra, John McDonnell and Andy Slaughter and Lib Dem peers Baroness Hamwee and Baroness Kramer.