Had joined an LBS breakout panel in clear admit essay questions webinar: a few points discussed there for the benefit or R2 applicants
Main essay 2 which is optional: Use it carefully, LBS believes that it will get all the information it need from its short answer questions and main essay. Optional essay can be taken up to explain anything that makes material difference to candidacy that adcom needs to know, such as reason for choosing a recommender who’s not your current reporting boss, gap in work etc... Any interests/stories that the adcom needs to know will also be a good fit here. Question to think is to judge the "what should adcom know" part and use the essay as relevant. Anything other than these explained via the second essay might get judged negatively was what was mentioned there.