London or Cairo? Why not Jordan. We did an overland from NL to South Africa in 2000. We saw many people in big stress not getting the Sudan visa in Cairo (waiting there for 2 months and still no visa). We got it within 1 day in Amman without showing anything such as recommandationletters, plaintickets. Only thing is you have 30 days to enter Sudan (we got in on day 37: they renewed our visa in Wadi Halfa without any problem).
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