Bensaminge,
The drink drive conviction will have increased your premium. You have to look at what else has changed though..... before you were caught drink driving, you had insurance on a 1.4 Corsa as a 19-20 year old, with limited driving experience.
Now you are having insurance as a 22 year old with, perhaps, 4 years driving experience. (it still counts as experience, strangely, even though you were banned) With a 2 year ban, they will probably recognise your previous insurance for no claims purposes,
If you have used a comparison website, try putting in the details that you had before your ban, (age, experience, car type etc) then add a DR 10 with a 2 year ban and see what happens then to your quote. Or put it the other way.... take out the DR10 from your current quote and see what it falls to. That will give you a measure of what the conviction is costing you.