Originally Posted by
eamus
Q: Can I backtrack?
A: You can backtrack within countries and continents, but you cannot re-enter a continent after leaving it, except: {...} (c) a transit without stopover in Europe on a flight between Europe and
GHANA/NIGERIA/KENYA/UGANDA/TANZANIA or vice versa.
This is worded wrongly. It should be "(c) a transit without stopover in Europe between GHANA/NIGERIA/KENYA/UGANDA/TANZANIA and another continent or vice versa". It means that you can, for example enter Europe in transit between North America and Africa. eg HKG-JFK-xLHR-ACC-LHR-HKG has two entries to Europe but is OK because of this exception.