Good morningpublished at 09:42 British Summer Time 27 June 2018
It's another scorcher on the sun-kissed lawns of the Stormont estate but we're in search of heat of a different sort as we hit day 80 of the Renewable Heat Incentive Inquiry.
Today's witness is a senior Department of Enterprise, Trade and Investment (DETI) staffer.
Chris Stewart was the department's deputy permanent secretary during the period being considered by the inquiry and remains with DETI's successor - the Department for the Economy.
The session starts shortly - stay with us for live video and commentary throughout the day.