You received an email to fill out a survey to get a year of Sophos Home Premium for free:
But when logging in to home.sophos.com, there is no option to fill out a survey.
It is no longer required to fill out the survey to get a year of free Sophos Home Premium. The account information used to register in the Sophos Home Premium beta automatically gets the free subscription for a year. Ensure that the email address and password used to sign in to the beta are saved.