Car insurance query? (UK)?

I am about 4 months into a 10 month policy and remembered today that i have a quirk that i didn't tell them about. (genuinely forgot nearly it!) i have another one they know about that be my fault. the one i didn't tell them wasn't my breakdown, if i phone up tomorrow and tell them will they void my policy or purely adjust the price appropriately?

i want to tell them as i want to be legal, but at equal time don't want my policy canceled

thanks
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