By Kirstin Ridley LONDON (Reuters) – The UK Serious Fraud Office (SFO) is investigating a small number of COVID-related fraud cases, although director Lisa Osofsky cautioned on Wednesday that the inquiries were at an early stage. Osofsky told a parliamentary committee, which was quizzing her and Chief Capability Officer Michelle Crotty on the work of the agency, that not all fraud cases linked to the pandemic reached the SFO’s threshold. But she added: “That being said, we are investigating a small number of cases that touch on COVID that would potentially cross our threshold. Mind you, we are…