There’s a big catch: they have to achieve this difficult endeavor without removing content, compromising performance or cutting corners when it comes to safety.

Though cars are losing weight, the UK’s lightest models still tend to be small, economy-oriented hatchbacks with little in the way of creature comforts. And, the heaviest cars on the market remain burly SUVs with large-displacement engines. There are a few notable exceptions to the rule, though.

Using exclusively kerb weight data provided by manufacturers, we’ve compiled a list of the 10 lightest and the 10 heaviest new cars for sale in the UK. Note the figures listed in this story do not include the 75kg ballast sometimes added to a car’s specifications sheet to represent the weight of a driver and cargo.