Sorry not much info on the larvae .
They are best known as a predator of aphids, and fully deserve the nickname “aphid lion” as a single insect can consume 100-600 aphids in its lifetime. Adults hibernate over winter, and breed in the summer. The first larvae to emerge are brown , about 4mm long, with sharp nipping claws at the front (beware!). The older larvae are paler, about 13mm long, with bristles on their back. Lacewings are supplied as juveniles, or larvae.
A great ID page for Ladybird / harlequin larvae ID HERE