I live in Ohio where we have much overcast most all of the year from the great lakes. In the winter when we have very few daylight hours, it seams like we don't see the sun for days. I have never had the pleasure of visiting the UK but, I did have a once in a lifetime journey to Ireland, thanks to my crypto involvement. We are planning for areas like yours and mine, starmman, and designing a way more panels/batteries can be added. We also, as of Monday, are adding the ability for the EGC solar staker/miner to be plugged into a wall outlet for those that live in a flat/apartment that may have little or no daylight inside nor the ability to place a device outside.

The pictures device is not the device we are presently designing the EGC solar staker/miner around. Because we are aiming for a price under 100 USD we need to focus more of that cost on panels and batteries, we are designing around a CHIP. The Pine64 is an interesting device and so are the solar packs GrumpyTiger has pictured. But the Pine64 seems to be an overkill that would need even more panels and more batteries to run, pushing costs far above the target. The EGC solar staker/miner will also not have a keyboard nor a mouse as it will be accessible via a web browser on the same attached local network. We also are experimenting with a small LCD, which may be an optional add-on.  

We are doing our very best to design the EGC solar staker/miner as a product that can be used in as many geographical locations as possible. Community ideas or comments are greatly appreciated. Thank you all!