We have looked into your below concern and it seems as though the main culprit of this increase is the strength of the Baht vs the GBP and USD.
There was a very little price change from 2015 to 2016 and the currency change we put into effect at the beginning of the year had an impact of cira 3.5% - 8.00% and not 30% - 40% as you have stated below.