Before you splash out on expensive made to order panels. Take a look at rockwool rwa45. It comes in boards 50mm 75mm and 100mm thick 1200mm X 600mn but can be easily cut to size with a small saw.

My plan was to put them in their naked form until I was sure of their benefit form and then cover them with some coloured material of my choice using contact adhesive and some clever origami at the corners.

One pack of 100mm rockwool contains 6 boards and costs about £25

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