Continuous improvement: I have a staff member recovering from an operation and one working her notice. Do they both need to complete the safety climate survey?

The full team should complete the survey wherever possible. The survey will give you the best material to work with if as many people as possible complete it. The perspective of someone leaving the business will still be useful, as will that of someone who is not currently at work. However, please consult your HR policy to assess whether it is acceptable to approach those on leave from work to complete. If not, then proceed with the remainder of the team.