The information below comes from NHS Choices and USHA Health Managers might find this useful. There is also a link below to a government website:
In respect of people coming to the UK from infected areas: Advice has been issued to the Border Force to identify possible cases of Ebola and there are procedures in place to provide care to the patient and to minimise public health risk to others.
In terms of transmission: It typically takes 5-7 days for symptoms to develop after infection, so there is time to identify people who may have been exposed, put them under surveillance and if they show symptoms, quarantine them.
The virus is not as easily transmitted as a respiratory virus such as influenza and Ebola victims do not become infectious until shortly before they develop symptoms. The disease then progresses very rapidly. This means infectious people do not walk around spreading the disease for a long period.
It would seem the likelihood of people getting into the UK infected is quite low, and in time educational establishments known to be accepting people from areas of risk would most likely get guidance from the authorities.
With regard to first aid, the chances of someone with the disease walking around and then suddenly collapsing appears to be fairly low
Members may find the flow chart at the end of the document particularly useful.