Below is a list of light bulb types used in 2017- VAUXHALL INSIGNIA lighting system, covering estate and hatchback vehicles.
Headlight bulb: low beam - H7 / high beam - H7
Fog light bulb: H8
Back-up light bulb: W16W
Rear fog light bulb: H21W
Rear indicator/turn signal bulb: PY21W
Boot light bulb: W5W
Light bulb sizes for other VAUXHALL INSIGNIA generations: INSIGNIA (A)