Layout Ribbon Tab missing from cui and ribbon

I need to create a section of a 3d model. Unfortuntaly the layout tab I need is missing. Normally if somthing is missing I type 'CUI' and then click Ribbon>Tabs> select the one I want and drag it to 'Workspaces Contents' - 'Ribbon Tabs'

The ribbon tab for layout is missing from the cui. See attached images.

How can I get the Layout Ribbon Tab back quickly?

(tutorial I am trying to follow)->https://www.youtube.com/watch?v=Q6CL0S4FOnE

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Image may be NSFW.
Clik here to view.