Ross Atkins talks about… Four reasons behind the tense relationship between the United Kingdom and China

This week, Yang Tingbo was identified as the 50-year-old Chinese businessman and alleged spy banned from entering the UK.

It has raised questions about an issue that many UK governments have taken up – the UK’s relationship with China.

As the UK Chancellor prepares to visit China in the new year, BBC analysis editor Ros Atkins looks at how relations between the two countries are strained.