Single storey extension with warm roof require vented soffits?

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Does a single storey extension require vented soffits if I'm going to have a lower flat ceiling and put wool on them joists?

Roof has roman tiles and breathable felt.
 
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Warm roof does NOT require vents.

The enclosed void of a warm pitched roof does not require to be ventilated. ... Rather than actively ventilating to the outside, entrapped water vapour diffuses through the vapour permeable underlay; negating the need for forming cavities or voids below the underlay

Google it as well.
 
So is the roof style a cold roof? What would make it a warm roof?
 

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