Unusual bug on Garlic Mustard

Unusual bug on Garlic Mustard

Observation - Unusual bug on Garlic Mustard - UK and Ireland. Description: Found this unusually marked bug on a Garlic Mustard (Alliaria petiolata) plant. Is it possible to get an ID for it?

Found this unusually marked bug on a Garlic Mustard (Alliaria petiolata) plant. Is it possible to get an ID for it?