When we published the ban on single-use plastics, we also published, as we do with every regulation, a regulatory impact assessment statement, which included a review of the economic costs of replacing single-use plastics, including plastic straws.
Potentially regrettable substitutions, like a straw that includes PFAS, is a regular issue we address. When we take action on one substance, we try to ensure we're also looking at potential alternatives. The government has an equally comprehensive agenda on managing the use of and risks from PFAS, for example.