As one who frequents and enjoys KRT on a regular basis;
go to the War Graves cemetary and see all the RAF dead for 1940-41, all around certain 10 day periods which I laterly discovered was offensive against Italians in Eritrea...in Gloster Gladiators!
also go to the old railway yards (wear long trousers against the snakes) and climb all over the old steam engines dumped there
as I understand it they used to route London and Baltimore -West Africa - across - to link to East Africa, Asia and beyond during WW2
google search 'RAF+Sudan+1940 (or 41)' shows up a lot
eg.
http://www.google.co.uk/search?hl=en...e+Search&meta=