I bought a newer version of the same car - so why is the tax so much more?

I had a Lexus SC430 2003 and changed for exactly the same car but a 2008. The tax for the new car is double the price of the the old car. How can the road fund be double for exactly the same car?

If my car is stolen, will the insurance be void if the car had no tax?

If my car is stolen, will the insurance be void if the car had no tax?

Does the DVLA still send renewal forms for taxing my vehicle?

Does the DVLA still send renewal forms for taxing my vehicle?