There you were last night, lying awake, fretting ‘why, oh why, does my otherwise excellent Vauxhall Insignia only have 16 LED bulbs in each of its headlight clusters?’ This stuff keeps us awake too.

GM’s European brand, Opel / Vauxhall, is preparing to renew its assault on the family sedan class with a new generation of the Insignia that adds the ‘Grand Sport’ moniker to its name, and which will ...