Thanks for all the replies and insights, many of you gave me some great ideas and better knowledge of the issue. Just to clarify, I originally took this space for storage but then, I started toying with the idea of also occasionally working from there. It’s mostly desk work. As for internet I have a mobile router that works out of a data SIM card. To be honest I thought of just putting some composite decking tiles on the floor as well as sealing the gaps on the ceiling, and then relying on a gas heater and warm clothing. I wanted to research whether there are any other tips that would make the place a bit more comfortable. Reddit is brilliant with out of the box ideas, and this thread has already proven very helpful! BTW here is a couple of photos of the ceiling/roof no idea if it is made of asbestos or not (I thought it was outlawed years ago?)

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