Car Write off payout, mileage valuation?

Just a quick question, bought my car for £3600, when insuring it the automatic valuation they told me was it is worth £3300, my car was involved in a car accident where someone hit into the back of me just two days ago, my car will be written off, i was stationary, just wondering if a cars mileage will affect valuation when insurers payout? anyone had any experience please do input, thanks