The weather has been crap recently, so today has been the first opportunity to continue the pointing.
The old cement around the doorway on the left is fairly vertical and flat as well as being well adhered, so we decided to blend the pointing into it.
The other side is all over the place and all the rock at the bottom edge is nothing more than rubble. The two pit props should hold the lintel in place while we remove and replace the supporting stonework with something more substantial.