car written off-given me offer, won't negotiate?

Hi,

Basically got my car written off and got an offer from my insurance. However, when I was looking at autotrader, there were prices that were a few hundred more for similar mileage,same reg etc
When I rang to tell my insurance, they said they don't go by websites like autotrader, as prices will vary. They said they will check on another motor system and run the car on that to see what will come up. They did this and got back to me informing me their price was better than the price from the database and are giving me a good offer.
Is there nothing else I can do then?

thanks in advance