The family of a British aid worker killed by an Israeli strike in Gaza in April called for an independent investigation into his death on Wednesday. James Kirby, from Bristol in southwest England, was one of seven people killed in a strike on a World Central Kitchen food convoy. The deaths drew the ire of world leaders and Israel called the strike a “grave mistake”. Former serviceman Kirby and two other Britons killed were part of the security team accompanying aid workers employed by the US-based charity. Speaking on behalf of his family ahead of a memorial service for Kirby, his cousin Louis…