If Keir Starmer wants to ‘deliver, deliver, deliver’, UK social investors can make Westminster’s money go further, argues Big Issue Invest’s new boss

OPINION: As Big Issue Invest celebrates its 20th birthday this week, new head Holger Westphely (pictured below) and original co-founder Nigel Kershaw (see box) say the concept of 'social merchant banking' is proven - but we must prepare for uncharted waters ahead.