LIBYAN leader Moammar Gadaffi is due to arrive in Egypt on Friday for a two-day visit, sources said on Tuesday. This as President Nelson Mandela hit back Tuesday at South African political leaders who criticised his links with Gadaffi, saying these ties had borne fruit in the Lockerbie case. Gaddafi is expected to discuss with Egyptian President Hosni Mubarak prospects for the handover for trial of two Libyans suspected of masterminding the 1988 bombing of a Pan Am airliner over Lockerbie, Scotland, in which 270 people were killed.