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Thanks. This seems a faff but probably the most achievable way I can get the smoothest finish. It'll be largely hidden when the fridge is in so I'm not super fussed on perfection but want it decent and also needs to be at a stage the electrician can get in and finish wiring back there (sooner rather than later) so plasterboard seems a sensible choice here?
CYOA-
If you do go for the dotndab the sparx can come and run his cables and put the back box in before the plasterboard goes up then come back to sort out the rest pretty quickly when it's ready.
As a fridge is going in there you will need to be careful and make sure there is enough room for the fridge. It's quite easy to come too far forward with the plasterboard. Ideally you want a bit of space round the sides so the fridge doesn't overheat.
Bobbo
If it were me I'd strip back to the brick in the alcove, then dotndab some plasterboard onto the brick so that it finishes flushish (ideally it wants to sit 1-2mm behind) with the front wall.
Next fill behind the plasterboard at the front edge with bonding to almost level with the front of the plasterboard.
Staple the anglebead to the plasterboard so that the bead sits level with the finished plaster on the front wall and skim everything with multifinish feathering it out as best you can at the edges.
Sand it all (you may need to do a lot of this).