Why so many different variants?
Not exactly clear! 
Should have got an S1, then it’s crystal clear 
not many evora out there really
Interesting looking at some of the numbers… Why do the totals of taxed and sorn jump around from quarter to quarter? for instance -
340R - 2012
Q1 = 79
Q2 = 84
Q3 = 75
I would suspect that the variance is due to people taxing/SORN’ing at intervals that don’t fit the quarterly data, eg:
If I tax in Q1 for 6 months, then I wouldn’t need to re-tax or SORN 'til Q3. However if I SORN toward the end of Q2 (ie. before my 6 months tax has expired) then Q2 figures will be +1 and Q3 will be -1.