As it often does the ANO is contradicting itself and talking bollox, if Class G was controlled airspace then how on earth (or above it) could you have an ATSOCAS?
Hence ORS4 No. 1238 - General Exemption E 4536. During the drafting of the Air Navigation Order 2016 class F and class G airspace were erroneously included in the definition of controlled airspace in Schedule 1. This exemption is necessary to alleviate from any adverse consequences as a result of this, until such time as the Order can be appropriately amended.