The rules for personal insurance have changed relatively recently and the premise of ‘utmost good faith’ has been removed.
Utmost good faith meant that you had to tell your insurer everything that may affect their underwriting decisions whether they asked you or not and if you were unsure you had to tell them anyway. Something like a Cat D would fall into this category. Failure to tell you could give them wiggle room at the time of a claim.
It was ruled unfair as Jo Public probably had never heard of utmost good faith and would not necessarily know what needed declaring and what did not and all the implications surrounding it.
It is now up to the insurer to ask all the questions they want answering to provide you with a quote and you must answer those questions honestly. If they ask if the car has ever been written off you need to tell them (or advise you do not know if this is the truth), if they do not you are under no duty to mention it.
Insurance underwriter for 12 years…