That's good, but some of it has to be historical offshoring manufacturing to places like China.

Carbon is still being used for industrial output, but just doesn't show up on the UK's carbon ledger.

China itself is making huge strides in generating solar energy, which is great for the world's manufacturing carbon footprint.

We generally do that, because it is just much easier for a country to reduce domestic emissions than abroad. The UK has a much harder time regulating Chinese factories than China for example. At the same time the UK also exports products and those might well replace high emission products abroad. Still we need to add carbon tariffs to force other countries to lower their local emissions.

Some surely is about offshoring, but most of it is about how electricity is generated.

There was work to quantify it a few years back

https://ourworldindata.org/consumption-based-co2