There are 20 van insurance groups for vans registered before 2016 and 30 van insurance groups after, making a total of 50 insurance groups now.
All vans registered before January 2016 had their van insurance groups numbered from group 1 to group 20 where group 1 was cheap to insure and group 20 was the most expensive to insure.
All vans registered on or after January 2016 had their van insurance groups numbered from group 21 to group 50 where group 21 is the cheapest to insure and group 50 is the most expensive to insure.