From the May 2016 release, the Overseas Trade Statistics were published on a Special Trade basis (see news article here).
For the Regional Trade Statistics, this change will be implemented from the 2016 Q2 release to be published on 6 September 2016. The commentary release and fixed data tables associated with the release will contain statistics on a Special Trade basis throughout to enable comparisons with previous periods to be made.
The interactive tables will remain on a General Trade basis up to and including 2016 Q1 with the period 2016 Q2 onwards being on a Special Trade basis.
Further detail will be available at the time of the release.