Some new superminis are easy targets for thieves, according to a survey by Which? Despite their green and economic reputation these small cars could cost more in insurance payments due to break-ins.
The consumer watchdog and magazine found that the Citroen C1, Peugeot 107 and Toyota Aygo are the easiest superminis to steal from - getting only 14 points out of an optimum total of 100 for preventing car theft.
"They are all based on a common design," the report said. "They are all built in the same factory."
"Shockingly, we broke into all of them in just three seconds without needing to cause any damage. Such primitive security places these cars near the bottom of the pile," it added.
The Kia Cerato also took a similarly short time of three seconds to break in to, while even the larger Vauxhall Zafira could be compromised within 18 seconds.
"But while thieves get more professional, car makers are too slow to increase security. With many cars it is still far too easy for a crook to get in and make off with the booty," the magazine said.
Satellite navigation systems costing from £300 to £1,500 are proving the biggest 'must have' magnet for would-be thieves.