subcommittee for NHSbuntu ran for one year 2017-18
the Apperta grant MOU for NHSbuntu has these relevant clauses
The grant recipient must keep a record of expenditure and all income generated during the Funding Period, and retain all accounting records relating to that expenditure and income for a period of at least six years from the date on which the Funding Period ends. Any software built during the grant award period must be released under an OSI license.
I checked the Roles and responsibilities document for subcommittee members. nothing about retention of materials.