Well how about the Labour Party, UKIP and Conservatives all being more right wing than the BNP?
(For those not British)
The British National Party (BNP) is a far-right political party in the United Kingdom.
That chart doesn't mean anything. Its a gimmick. Its not a true representation of people's political spectrums.
By several measures, the BNP is more left-wing than the Tories or even Labour. They want trade controls over foreign goods, prosecution of the bankers associated with the '08 crash, "the renationalisation of monopoly utilities and services", "- The creation of a bulk transport tax regime that pushes supermarkets to supply more local and seasonal produce;" a fully public NHS, "Take all privatised social housing stock back under local democratically controlled council ownership," etc.
Being 'right wing' in terms of social policy does not imply being right-wing economically.