Via The Guardian: Ebola: what is the real risk to the UK? Excerpt:
If somebody with the virus in their body but not yet ill arrived at a UK airport, they would not be detected – who would know? But border control staff have been warned of the symptoms expected of those who fall ill. Those are rapid and serious, which means that doctors would be called in immediately. If the patient had recently been in west Africa, Ebola would have to be considered as a possibility and every precaution taken.
In Europe and north America, infection control measures are stringent and would rapidly be put in place. The sick person would be isolated in hospital and every contact would be traced. Those people in turn would be quarantined in case they developed symptoms.
It happened with Mers, where a man from Qatar died in a London hospital. Experts from the Health Protection Agency, now part of Public Health England, followed up over 60 people who had come into contact with him and traced more than 100 others who had had contact with his family. None had picked up the virus – but the reassuring part is the efficiency of the tracing process in the UK.
Sadly, in west Africa, that sort of effort is presently nearly impossible.