As for (ii) -
if top tier corporate work is of central focus that should work out in your favour, as I know Slaughter and May still considers itself to be the best firm in the market for that. Whether that is actually the case is more debatable; the important factor is that if you make a good argument to that effect then it looks plausible that you would choose
Slaughter and May over the others. What could that argument be? Well, firstly, you could focus on the (relatively uncontroversial fact) that
Slaughter and May is considered to be the best firm for UK public M&A work, and then explain why public M&A is more attractive to you than private M&A. Alternatively, you could focus on the idea that
Slaughter and May arguably has the deepest institutional relationships with UK corporations (for a number of years they advertised that they represent more FTSE 100, 250, and 350 clients; and also of being the default 'boardroom advisor' of UK corporates) and then explain why that kind of market position attracts you. However, I would be research and aim to be able to defend the claim that
Slaughter and May will be able to keep its position despite its lack of international offices (particularly in New York, where the other MC firms are heavily investing into) and dwindling best friends network (particularly having increasingly lost its US best friends as they moved into London -
Davis Polk a number of years ago, and now Paul, Weiss, and to an extent Cravath as well).