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Oh no, this is far beyond my skill set, and a little way off. Was aware of the need to BC sign-off and will consult with an engineer nearer the time. My thinking with a Catnic was that it would be less destructive than knocking out a course of blocks, though maybe I'm misunderstanding a) my current setup and b) how much height can be gained from using a Catnic rather than a concrete lintel. Rendered blocks I'm fairly sure so the aesthetics isn't much of a concern.
Polygon
You can certainly move the lintel up by enough to get good head clearance, a Catnic (other brands are available) will allow you to have a soldier course above opening.
You’ll need to get proper specs for load etc.
Would you do the work yourself?