Look on E bay or Autotrader for what the retailers are asking now for your year and model and add back a years value £1000 at the most. Or when did you buy it how long you had it and take money off what you paid for it approx. £1500 - £2000 per 12months. If you had the car on a public road than it should have been taxed and insured. Laybys are public hence your car got hit! Do not expect too much from your insurance has these Astras depreciate like a stone

Can anyone tell me how much my cars top used price would have been in December 2019.

My car is a 2017 17 reg Astra elite nav 1.6 cdti 109 BHP. 5 door hatch. 21k miles with 1 former keeper. My car is silver with full service history.

Needed for disputing an insurance company. Thank you

As others have said in your other post, difficult to calculate historically.

For an identical car registered in December 2018 i.e. 2 years old as yours was..... £7650 trade in, £9350 private, £10500 retail.

Insurance company will try and give you trade value, you have to provide evidence of what it would cost to replace it. You may have to concede that as yours was a 2017 model, they will pay out the value for a 2017 model, otherwise would be regarded as " betterment". I'm surprised you didn't get a valuation when the accident occurred, not 12 months later.

I see on Wikipedia that parkers price guide was still available as a paper copy until 2020. If so you could track an old copy down and see what it thought your car was with then? I'm not too sure how accurate their prices are but that would be a start.

If the insurance company quibble this you can get a Parker price now and see how v that compares to their offer for your car today.