The immediate and obvious difference in the cattle TB trends of these two parts of the same island is the 2002 post FMD spike experienced in NI. However, when this is removed from the equation, the two trends are almost identical. In fact, the trends are exceptionally similar for this sort of exercise.
Viewed in this way, there is nothing in the data to suggest that culling has had any significant impact on cattle TB whatsoever.
Furthermore, the very effective and sustained reduction of the post-FMD bovine TB levels in Northern Ireland was achieved solely by the introduction of enhanced testing, movement and biosecurity measures.
What Alistair Driver has unintentionally demonstrated is that it is cattle movement, not the absence of any badger culling programme, that is responsible for the unacceptable high levels of bovine TB in the British herd.