Picture posting is enabled for all :)
Thank you for suggestions and ideas, plus information about your own growing conditions. Amazed some of you are keeping your lemons outside, I am possibly mollycoddling it too much regarding the temperature.
Regards burying whole lemon trees in TX that sounds odd- and a bit of a challenge (ours grew to about five feet tall in the space of a few years). Maybe in the North of the State as it can get very cold up there...I did a quick Google and there may be some useful info for UK growers at this link: https://dcmga.com/north-texas-gardening/trees/citrus-in-north-texas/
Vinlander- I think burial might work, but to me the biggest challenge would be to keep the damp (and especially the wet) out... Keep us posted! All the best.