You could try hanging a decorative quilt on one wall, it will help mop up the sound the same way heavy drapes would.
I have a giant indian woven wall hanging on the wall between her room and the dining room. It has stopped a little of the noise.

We have to replaster the room because it's the old rendered plaster on fibreglass back so might look at soundproofing materials. Maybe if we put that pinboard material inside the panels it might help.

Thanks for the input ladies, much appreciated