LSX cable has an aluminium screen , which according to the manufacturer "provides all the safety benefits in the event of nail penetration", "screen provides instant response if penetrated by a conductive metal object and coupled with a type B circuit breaker. https://uk.prysmian.com/markets/electrification/industrial-and-construction/building-wires/lsx .
They and others seem to say that it's acceptable for burying less than 50mm and not protecting with a RCD
Cleavland have CSX that goes up to 10mm https://www.clevelandcable.com/en/BS8436-protected-screened-fixed-wiring-cable-1mm-10mm
I would think the thinner cable is easier to work with a terminate inside a dwelling, I haven't seen many people talking about using it. I am wondering why?
