From the NATS website

Proposed change to the Belfast TMA from Class E to Class D

This consultation is about a proposed technical change to the classification of Belfast BTMA1 and BTMA2, from Class E to Class D.

The period of consultation started on Friday 9th October 2015 and will close at noon on Monday 14th December 2015, a period of nine weeks and two days.

NATS expects aviation specialists in Northern Ireland to be the primary stakeholders, however anyone considering themselves a stakeholder may respond.

The consultation material provides details of the proposed change, including how to respond.