Tyres.co.uk offers Vauxhall Insignia tyres with the choices of Continental PremiumContact 7, Goodyear EfficientGrip Performance 2, and Michelin Primacy 5 in 225/50 R17 for the diesel models of the 2.0-litre in the years 2014-2017 with authorised wheel sizes from the manufacturer. Make sure to confirm the registration/door label specs before making your purchase. Remember to check for load index, speed rating, and anything that has the specs XL.
For Vauxhall Insignia, the tyre pressure/loading sticker is located on the driver's door. You can find the OE tyre specs from here.
Vauxhall Insignia front wheel drive units do not always need all four new tyres. Fit the new tyres as a pair on the rear axle. Vauxhall Insignia 4x4 (due to the all wheel drive system) needs all four new tyres very close in specification. Therefore, if any of the tyres show wear, and there is a difference in specification, then all four need to be replaced.