1930 seems to be in vogue with some people, so remove it carefully and sell it on e-bay.
Before you start.When you block this chimney, you will unbalance the existing humidity in the room.
You will undoubtedly find the room and that part of the home warmer.
And probably the question of humidity will arise, with cold beds and condensation on windows.
If that doesn't put you off. Then you should have the chimney swept as it sounds like it needs it.
Although after all this time, its probably the parging that crumbling.
Then you must seal the top of the chimney to avoid rain falling inside and making the home wet.
And seal the bottom.
Then if the chimney is on an outside wall, you must fit air bricks at top and bottom to create a air flow to help keep it dry.
This will make the chimney breast cold (only one brick thick) and you may get a damp patch.
Which can be avoided if you cover the chimney breast in say one inch of polystyrene.
And thats about it.
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