Obviously it's totally dried out. Didn't occur to me to water it over winter but clearly I should have done as now this is the result. Is it a lost cause or should I persevere with lots of watering? Or something else? The tiny hint of green in the centre of the plant makes me think it's possibly not completely dead, but I don't see any new shoots.
Oh brilliant, thank you! That's so reassuring - I thought I'd killed it. What should I do in the meantime? Cut off the dead stems? Carry on with watering (but not too much)? Anything else? Or will it just revive itself as the weather gets warmer?
If it's bone dry, then give it some water now, and cut the old straggly leaves off. Then wait. If you don't get much rain then make sure it doesn't dry out - terracotta pots are famous for doing that pretty quickly because they are porous.
Then, in a few weeks, watch in wonderment as the new leaves unfurl. They really are magical