As a general rule, smaller cars with less power are cheaper to insure as they're seen as less risky options. Putting a named driver who’ll use your car on your policy can bring your premiums down as long as they’re not deemed high risk as well. Driving courses like Pass Plus may help a driver get a car insurance discount, while telematics (black box) policies can also lower a premium for a young driver. The Volkswagen Polo, Hyundai i10 and Toyota Aygo all have fairly low insurance bands (depending on a few factors like the engine and the trim you choose) — but I'd also recommend having a read of this: heycar.co.uk/guides/which-cars-have-cheap-insurance