Not sure about that.
I had a small crash in January 2018 on an icy road, my tank is DIY fitted, and the insurance company still paid out and did all the repairs. They didn’t batter an eyelid at any of the equipment.
Also when I was 21 I had a heavily modified Mazda mx5, a lorry crashed into it, insurance man came round, said ‘hmm, it’s been heavily modified etc etc, - still paid out, no other questions asked.
I think people fear insurance companies too much. Generally, they do pay out.
And no, for the cautious ones, I’m not advocating to not tell insurers, but I am saying, if you have missed a bit of info out, they will most likely not care as long as you’ve been paying your premium.
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It seems to depend solely upon the attitude / Terms & Conditions of the individual insurance companies.
I had trouble getting off road cover on a couple of occasions. Several well known companies wouldn't allow me to drive into my field to fill up with water. Some companies wouldn't insure for the purpose of access and others said that it would invalidate the entire policy. This actually seems to be a standard theme with many companies but they usually bury it in the small print. Presumably they don't want you falling into a ravine and then claiming for a new truck..
I did try reasoning with them but eventually ended up at Gladiator who listened to what I actually needed and then found me a tailor made policy that included off road cover, mods to my truck and having a water tank in the back.
£191 this year with all mods and intentions declared.