Experts have warned Britons that they could be at risk of losing their car insurance benefits without knowing, and it could cost them thousands of pounds. Millions of motorists could face invalidating their no claims discount and still be paying full price for cover, with experts calling on drivers to check. Taking a break from driving or switching to becoming a second driver on a policy could break a no claims discount, an expert has warned. A no claims discount, or no claim bonus, is a cost reduction applied to car insurance premiums for drivers who haven’t made any claims. Do you have a sto…