Living off-grid in my shepherd's hut means I genuinely couldn't tell you what my energy bill is — it's essentially zero beyond the occasional propane top-up for the stove. But I do track my Victron system obsessively, and what I have noticed is that my Fogstar Drift LiFePO4 bank is cycling far less aggressively this winter compared to last year, which I attribute to finally getting the solar array angle optimised for the lower sun elevation.
For those still grid-tied, I'd be curious whether the drop you're seeing is genuine reduced consumption or just the price cap doing some work. Those two things can feel identical on the bill but have very different implications for what you do next.
Worth pulling your actual kWh figures from your smart meter rather than just the £ total — Octopus and others make this reasonably easy now. If your consumption is flat but costs dropped, that's policy. If consumption dropped too, that's worth understanding why, because you might be able to lock that behaviour in permanently.
Anyone running a hybrid setup — partial grid, partial solar storage — noticing anything interesting with export payments this winter? I'd expect lower generation hours to be squeezing the economics noticeably.