Skirting board removed along with other stuff

[absolute0]

I've gone and removed a load of skirting board today on walls that comprise mainly of breezeblock. However, when taking the nails out, quite a lot of the cement/plaster layer covering a wooden horizontal support has come off.

I would like to put new skirting on soon and I am concerned that there won't be enough surface area for the skirting to butt against.

What is the best approach here?
Use gripfill to make up the void and secure with screws?
I understand that putting a plaster coat against wood probably won't work.

Any ideas?

 

[JohnD]

I'd fix a wooden batten to the wall, its top level with where the top of the skirting will be, and packed out flush with the finished face of the wall. Patch up the plaster neatly against this batten.

Fix another batten to the wall, maybe an inch above the floor.

When you've finished your plastering, fix the skirting to the battens with small csk screws.