All I can say is " if it walks like a duck and quacks like a duck then it must be a duck"... As far as your interviews in London, From my experience the results were transmitted to Lagos within 72 hrs, but the DO is really slow in getting the final confirmation to employ.
I would "Strongly" recommend that you consider 'ALL" the PRO's and CON's before committing to ARIK. There is another strong Parrallel force that is controlling, which has a decided effect on every aspect of things in Nigeria.
"BonChance' on your decision.
CH.