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Thanks for the comments; I decided to engage an SE to put my mind at rest :)

Can anyone comment? How much wall is not enough?! I assume there is a reasonably simple way to calculate how much wall is needed to support a given load. Am I worrying over nothing?

I was planning on 2 separate lintels, one for the window and another for the door

The doors just have a piece of timber above them, not sure why they didn't install doors tall enough to meet the lintel. Yes definitely steel, Catnic are suggesting one of these https://catnic.com/assets/datasheets/lintels/cn81-c.pdf But I'm asking if I can use one of these instead...

The back of my house is effectively a single storey (house is built in to a hillside) and the wall is a block/brick cavity wall supporting a roof of interlocking (concrete?) tiles. It's a 1990's Wimpey construction. In this wall is a 1200mm wide window and a 1800mm french door, both have some...