New figures from Sainsbury's Finance have demonstrated that not shopping around for car insurance cover could prove to be costly.
It found that British drivers pay out a collective £73 million every year because their policies do not cover them for occurrences such as accidents and lost keys.
Some seven per cent reported having to foot a bill for car seats or courtesy cars after finding that their policy did not offer it as standard, with many admitting to simply looking for the cheapest cover when insuring their vehicle.
Head of Sainsbury's car insurance Ben Tyte warned that not all policies are created equal, with 60 per cent failing to covering motorists for transport expenses after an accident.
"When choosing a car insurance provider it is vital motorists compare policies on a like-for-like basis; looking at price alone could have disastrous consequences," he added.
Sainsbury's - which was the first supermarket to open a bank back in 1997 - offers both a standard policy and a Premier Cover option.
Compare more than 100 brokers to find the right deal on car insurance