BUZZ — Airtel Africa falls on report unit weighs smaller London IPO

* Airtel Africa falls 2.8% to 339.4p; top loser on FTSE 100 index * Bloomberg News reported on Thursday that Airtel Africa unit Airtel Money was considering downsizing its London IPO * Airtel Money now seeks to raise at least $800 mln, substantially below its previous target of $1.5 bln-$2 bln. * As of last close, AAF flat YTD (Reporting by Atharva Singh in Bengaluru) ((Atharva.singh@thomsonreuters.com)