Air Nigeria
Where did you see this being confirmed as it does not show up on their website and booking engine, although after doing a search I did read that two A330s are to be leased from Egyptair but nothing about a confirmed London start date!
Although Air Nigeria have previously announced a Lagos to LGW route from what I have read after my search it just says London although fingers crossed it will be LGW.
If Air Nigeria do commence flights to LGW another new long haul carrier would be most welcome at LGW to at least make up for the recent loss of Air Asia X, Air Zimbabwe and Delta and Africa is very underserved from LGW.
All we need now is for the return of Air Namibia to LGW, AeroMexico, Garuda Indonesian and maybe Philippine Airlines announcing flights and maybe and a big maybe Aerolineas Agentinas.