If you have expensive in car entertainment make sure your car insurance policy provides enough cover to meet the cost of replacing it and it has been declared on the application form, if it is not standard equipmenty in that car.
Some companies now offer child car seat replacement, which means they will replace your child's car seat after an accident even if there is no visible damage.
If you own a "classic car" you may be able to get cheap insurance if you only do limited mileage each year. Often many companies have special rates for thsi type of vehicle especially if it is not your main car.