Stephen Lansdown, co-founder of Hargreaves Lansdown and owner of Bristol Sport, is also a prolific investor, and was an early convert to the cause of green and sustainable investment in his portfolio. He helped Guernsey Finance to launch its latest research report, Family Offices Financing Sustainability in London.

“Sustainable means it’s going to last,” Mr Lansdown explained at the launch, adding that he is “looking at investments that are sust...