Cheers. Made me laugh! I'll have a look at the fiio M11 ( I have no idea what most of these gadgets are)
The shed is fully insulated now, with double glazing, 240V mains, infra-red heater & reading lamps. Still working on fitting the oak-veneer panelling and insulating the door, maybe turning it into a "stable" type door, so I can look at the tree tops as I recline listening to music in the summer. I'm fitting a 2.3m x 0.7m day bed/couch with 100mm thick foam upholstered cushion. So it will, when finished, be quite a comfy space.
The "tea-chest" sound quality is one reason for thinking of going down the headphones route. Plus, I don't want to annoy any neighbours with bass pulsing music. Not much room for speakers either. My Kef LS50's look massive in the tiny space. I got a couple on Anker Soundcore Flare mini bluetooth speakers from Amazon yesterday for £54 just to tide me over. They can be a stereo pair.
By September, the weans (children) will have hopefully moved out to London and Aberdeen respectively and I can re-claim the living room (and even their vacated bedrooms!).