Saw this tiny larvae about 5mm long, today in our garden at Todmorden. I think it is an Orange Ladybird larvae Halyzia 16-guttata and it used to be quite rare but has spread North over the last 20 years.
Both the adult and larvae feed on mildew. They used to be confined to Oak trees but now more common on Sycamore and Ash and were formerly an indicator of ancient woodland. It is my first sighting of the larvae