Just to clarify, this is not the first leg, but the 3rd one. I left from CDG for a CDG-LHR-CAI-LHR-NRT....
Now I feel too lazy to go back to CAI and would feel somewhat better to leave from SSH, but since I have to jump into a LHR-NRT leg, I will see if it is manageable to arrive in LGW.
I think that the egyptian BA lady on the phone just wanted to get rid of me, I will try to call back in a few days and see if I get someone more willing to spend time with customers.
I remember also that someone posted references about a reliable and knowledgeable travel agency in CAI, so will try to search the forum and get my hands on this one, it might be useful.
Thanks