(Reuters) -Britain’s finance minister Rishi Sunak said on Sunday he had asked Prime Minister Boris Johnson for a review to determine whether he had stuck to the rules on ministerial declarations following criticism over his family’s financial arrangements. Sunak said he had written to the prime minister asking him to refer Sunak’s ministerial declarations to Christopher Geidt, the independent adviser on ministers’ interests. “I have always followed the rules and I hope such a review will provide further clarity,” Sunak said on Twitter. Sunak has endured a torrid week in which a substantial inc…