Plaster repair after leak.

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An update on this post.
On the advice of a neighbour my daughter contacted a small local builder. He does not think rising damp is the problem. However, he has agreed to inject a dpc into the 2m of affected wall for a reasonable cost and issue the note the insurance company wants to proceed with their repair..
His suggestion is that when the area was saturated from the leak salts have been drawn into the wall. The salt is now absorbing moisture from the air making it appear damp. The salt has to be neutralised before replastering is started.
Many thanks to everyone who took the time to reply.