Larva and Pupa

. . . on the underside of a sycamore leaf.

These will turn into small orange ladybirds with 16 white spots.
Halyzia sedecimguttata


I found 4 larve and 3 pupae.

I blipped an adult four years ago here:
https://www.blipfoto.com/entry/2433059276843911048

One of the other larvae is in the 'extras'.