BUZZ-EnQuest: debt relief
** London-listed oil and gas producer's shares soar as much as 54 pct after lenders relaxed covenants until mid-2017
** Co renegotiated credit facilities and cut capex, but still expects production in 2015 to improve as output from two key assets ramps up
** "It looks like Enquest (LSE: ENQ.L - news) has taken serious actions to deal with the lower oil price environment," Swedbank (Other OTC: SWDBF - news) analysts said in a note
** Stock jumps most ever in a single day and was the biggest boost to the FTSE Small Cap index
** Co has access to $1.2 bln in credit facilities plus a $500 mln accordion facility (abhiram.nandakumar.thomsonreuters.com@reuters.net)