How To Patch Plaster Old Walls When Back To Brickwork

When I stripped the lining paper in this room it pulled the plaster out back to bare brickwork as there was some damp issues.
First I used a PVA and let it dry. Then I used a bonding coat of undercoat plaster then two skims of Easyfill 20. I then sanded it all down with a Mirka sander and applied PVA again.
When that was dry I hung grade 1000 lining paper and redecorated th