This year's Blue Book includes large scale changes to the sector and financial accounts including the separation of household and non-profit institutions serving households sectors. Due to the amount of work involved the decision has been taken to delay the publication of historic sector and financial accounts data prior to 1997 while we complete final quality assurance of this part of the dataset. We appreciate user interest in these historic data and plan to publish them as soon as possible and no later than 31 October 2017. GDP series and the current account balance are not affected and will be published from 1948 annually and 1955 quarterly as planned. We apologise for any inconvenience.