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Ok, thanks. I was thinking as there's power in there, to use as is for now and then probably go purpose built down the line (especially if home working continues to be prevalent. But if there had been an option which would make use of this shell longer term thought I'd consider it. Thanks for the advice. Do you mean that the above (or similar) was their biggest seller and used as home office?
It's a standard CNC tongue and groove single skin "log cabin" there should be a small (15mm PIR board is the norm IIRC) amount of insulation in the roof and maybe some in the floor depending on the installer. The wood the walls are constructed from does have a insulative value, but not much. All of this means that while it will perform better in terms of being too cold in the winter / too hot in the summer than a standard shed you will still feel it.
The normal way to sort this in say a single skin brick building would be to batten out the wall and put plasterboard on it, filling the cavity created with insulation. Unfortunately you cannot do that with this building as the "logs" it's made from will expand and contract with changes in humidity and temperature, the battens would fight this and eventually it will fall off or damage the structure of the building.
Basically you have two options deal with it as is (you have power and heating after all). Or tear it down and start again. If it helps I used to do contracting work for a company who sold and built these things (if they were too busy or had a particularly complex job on) their biggest seller was units that size for home office use and the vast majority of customers loved them.