Got any wood glue. It's PVA so mix a bit with water 4 to 1.
Remove loose plaster.
Seal with PVA.
Let that dry for a couple of hours.
Toupret powder filler.
Fill in 2 or 3 goes allowing an hour between fills so it sets.
When dry sand smooth
If you need to find a tradesperson to get your job done, please try our local search below,
or if you are doing it yourself you can find suppliers local to you.
Select the supplier or trade you require, enter your location to begin your search.
Please select a service and enter a location to continue...
Are you a trade or supplier? You can create your listing free at DIYnot Local