Do pencil pleat ready made curtains and pencil pleat tape need to comply with the regulations?

Yes. Pencil pleat ready made curtains and pencil pleat tape fall within the definition of a corded internal window covering as they are curtains and fittings used with a window covering that can be used inside a building and have a cord.

This interpretation is premised on the basis that the cords contained within the pencil pleat ready made curtains and the pencil pleat tape are used to operate a corded internal window covering by gathering the top of the curtain.