Posted By: modernvictorianI am planning on applying Bauwer insulating plaster to this wall. It is claimed that the plaster 'stabilises old walls' however I am wondering if I need to repair and repoint before going ahead?

Can't speak for the Bauwer product, but if you were applying lime to that you'd want to fill the biggest holes first and let them harden a little then put a scratch coat over the whole lot and then think about body coats and top coats etc. So effectively you'd be 'repairing and repointing' as part of the traditional practice of lime plastering anyway.

Posted By: modernvictorianlittle wood wedges

They look like they would have been to fix a sash window to (before the days of Rawlplugs)

I would add a sheet of expanded metal lathing over the bricks, wrapped round the corner, then plaster

The replacement windows are triple glazed so a decent depth. And because they will sit in the inner skin of the brick wall they will overhang into the room. So no reveal to deal with.

I have ordered some mortar to fill some gaps in the window openings so I might repoint the worst bits before starting with the plaster.

The Bauwer light has actually proved useful for filling all sorts of gaps and voids. Especially since I have whole pile of out of date bags to use up (another story). Yes a lot of wetting down is required but that's not a problem. I have a portable Karcher mini washer (designed to keep in the car for washing down bikes etc.) that is perfect for the job.