On behalf of the International Retrovirology Association and the local organising committee it is my pleasure to invite you to register for the 21st Biennial International Conference on Human Retrovirology: HTLV and related viruses.

This will be the first face-to-face conference since we met in Lima, Peru and notwithstanding the success of last year’s virtual meeting we are excited at the prospect of welcoming you to London, to an exciting programme of science and policy with the added value of planned and impromptu discussions.