UK's Chief Medical Officer now feels it's only a matter of time before it escapes Africa: the Lagos case flew from Liberia, there has been at least one case where the family "liberated" the patient.

The virus is not contagious in the incubation period, but once symptoms appear, the very nature of the symptoms (bleeding from mucilaginous tissues, principally mouth, nose and bum) leads to gross propagation of the virus. In particular, irritation can cause coughing up of blood in aerosol form, which can migrate. One study has also shown that the worst form can transmit by air.

Sadly, the UK's isolation hospitals have almost all been converted into flats (Colney Hatch, Enfield Highlands). I don't think I'd like to own one of those if the need has to be reversed...