I think we're being a bit harsh here on the insurance companies. Insurance is a risk based assessment. You tell the insurance company details of you, your health, previous driving history, the car etc etc and they assess the risk to them of what it might cost in the event of a claim. Then they provide you a premium.
If you put in a claim and any of the above is different, well then that's not the risk they agreed to take on, is it...so they may choose to argue that the contract is null and void. Some people find this out the hard way.
Safest bet is to tell them everything. Even if you're not sure it matters. Holding back information because you're worried it'll cost you more is folly, if there's a reason it'd cost you more then the insurance company need to know, clearly, and withholding it is a big risk to you.
Think about it, it's quite cheap really. They're insuring a £20-30,000 car plus potential medical and loss of earnings bills for other claimants if the accident was your fault, these can run into hundreds of thousands of pounds.
I'll say it again, insurance is cheap in reality (even though I'll complain about the cost as much as the next man...:wink
And a pox on all those uninsured drivers who bump our costs up...grr...
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