yellow 6 legged bug

Observation - yellow 6 legged bug - UK and Ireland. Description: on the side of my van, yellow with two lines of black spots running down its length. looked like a cross between a caterpillar and a fly (6 legs). sorry for poor pic.

on the side of my van, yellow with two lines of black spots running down its length. looked like a cross between a caterpillar and a fly (6 legs). sorry for poor pic.