Georgia's TBC Bank gains on higher Q3 net profit, share buyback plan
** London-listed shares of Georgia's TBC Bank TBCG.L up 6.7% at 5,090p
** Stock top gainer among London stocks
** Q3 net profit rises 10% to a record 404 million laris ($157.36 million)
** Co announces 50 million laris share buyback programme
** YTD, TBCG up 25%
($1 = 2.5674 laris)