The workshop venue has capacity for about 100 participants. Registration will be in two phases: 1. An expression of interest for potential participants to state their science interests (forms will request a primary science area, either one of the existing science working groups/focus groups or a free form entry) [now open] 2. Invitations to register and pay (workshop fee will be £200). In the event of more expressions of interest than the capacity allows, preference will be given to the broadest possible scientific and national representation.