Jan 11 (Reuters) - UK"s competition watchdog said on Tuesday it was looking into the potential purchase of a stake in Scotia Gas Networks by Canada"s Brookfield Asset Management Inc (BAMa.TO). UK power producer SSE (SSE.L) in August agreed to sell its entire 33.3% stake in Scotia Gas Networks for 1.23 billion pounds ($1.67 billion) to a Canadian consortium of Ontario Teachers" Pension Plan Board and Brookfield Super-Core Infrastructure Partners. read more ($1 = 0.7358 pounds)