Very easy,
You need the letter from the British Embassy, which is about 200 metres down the road from the Sudanese one on Ibrahimi street in Cairo.
Go to the Uk embassy first, pay about 30 quid to get the letter (not actually a letter of endorsement, but a letter saying they won't give a letter!) Then take that to the Sudanese embassy with your hundred dollars and a couple of photos.
There is quite a bit of waiting involved sometimes, other times people are lucky. I waited over a week, I know people who have waited more than a month, others who have had it next day.
This is a walkthrough I posted a few months ago, how to do the Egyptian border.
http://www.horizonsunlimited.com/hub...crossing-44176
Birdy
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