Insurance group and Tax with cars - 留學

I am sorry that my computer can not use Chinese on PTT

I hope to know what is Insurance group

My Insurance group is 13

And I hope to know what website can find Tax of cars

The following website shows the car I want to buy

http://www.compucars.co.uk/used-cars/audi/a4/a4/for-sale/?1321848

Please help me

Thanks


--