wemmick has his Little Britain personality and his Walworth persona. Do you think this is healthy? Why or why not?

I think if the person is fully aware of the duality of his personality and is able to keep it all in context, it's healthy. Wemmick seems to navigate his comfy home life with his austere city life quite well. He seems to be able to separate business and family effectively. Even Jaggers is surprised to see this kinder gentler side of Wemmick. A person has to really know themselves to successfully pull this off or it becomes really unhealthy.