The Assistant Commissioner’s city wanderings and solitary meal symbolize his freedom from sitting behind his office desk and being dependent on his subordinates. He is getting back into the riskier solo detective work that he prefers to do. In addition,, the reference to the Italian restaurant and the Assistant Commissioner’s “foreign” look are intentional. Despite his own desire to isolate and expel foreign elements from London, London has assimilated elements of foreign cultures, and the resulting cultural mix rubs off on English citizens too. In other words, it’s not possible to fully separate “foreign” and “native.”