I'm looking for some advice on internal cork insulation.

I have a 1880 victorian terraced house, with brick walls. I'm looking to add some insulation to an inside of the rear wall. Later I hope to insulate the outside. Possibly with cork.

For space reasons I'm only adding about 30mm, but I think it should make a meaningful difference to the brick only wall? I''m also doing it so as the wall needs redecorating and has damaged plasterwork.

My plan is to use about 25mm of expanded cork tile affixed to the existing plaster with isovit e-cork.
I want to cover that with a decorative cork layer. Something like this: https://puretreecork.com/product/36033

My questions are:
-Anything about this a bad idea.
-Does anyone know if any decorative cork layer is breathable? I've not been able to find much about how the decorative layers are made.

You can use cork, and your choice of a cork adhesive is good. Retailers such as corkstore24.co.uk also sell it in larger sheets.

For a breathable, better insulating, but much more expensive option, you could alternatively use Aerogel sheets.