Vauxhall’s all-new Insignia, which replaces the Vectra, will go on sale priced from £15,935 for the 140PS 1.8 petrol Exclusiv model and from £16,935 for the 130PS 2.0-litre diesel Exclusiv.

These prices undercut the equivalent Ford Mondeos which cost £16,395 and £17,495 respectively.

The UK will have a choice of five engines from launch consisting of three petrol and two diesel units.

Standard kit on the Exclusiv trim includes anti-skid control, auto headlights, part-powered driver’s seat, cruise control, aircon and six airbags.

The 130PS diesel, expected to be the biggest business seller, has a CO2 output of 154g/km, putting it in the 21% benefit-in-kind tax band – one tax band higher than the equivalent Mondeo. The same engine also comes in at 48.7mpg for the official combined fuel consumption.

Insignia vs rivals
Low power diesels Engine/trim CO2 (g/km) BIK tax (%) Power (PS) P11D price (£) Top speed (mph) 0-62mph (secs)
Vauxhall Insignia 5dr 2.0 CDTi Exclusiv 154 21 130 16,735 125 10.7
Citroen C5 4dr 2.0 HDI SX 157 22 138 17,295 127 11.6
Ford Mondeo 5dr 1.8 TDCi Edge 154 21 125 17,495 124 10.2
Renault Laguna 5dr 2.0 dCi Dynamique 158 22 130 18,100 127 10.6
VW Passat 4dr 2.0 TDI S 153 21 140 17,990 130 9.8
Insignia vs rivals
High-power diesels Engine/trim CO2 (g/km) BIK tax (%) Power (PS) P11D price (£) Top speed (mph) 0-62mph (secs)
Vauxhall Insignia 5dr 2.0 CDTi SRi 154 21 160 19,835 135 8.9
Citroen C5 4dr 2.2 VTR 172 25 173 19,895 136 10
Ford Mondeo 5dr* 2.2 TDCi Titanium X 165 24 170 24,095 139 8.4
Renault Laguna 5dr 2.0 dCi Dynamique S 172 25 175 20,525 136 8.7
VW Passat 4dr 2.0 TDI Sport 160 23 170 21,260 138 8.6
* No lower spec car available with this engine