UPDATE 2-Qatari fund buys UK's Heritage Oil for $1.6 bln
* Al Mirqab is investment fund of former QIA CEO * Offers 320 pence per share, 25 premium * Heritage founder to remain invested * Shares soar 22 pct (Adds analyst comment, share price, background) By Sarah Young LONDON, April 30 (Reuters) - British oil company Heri
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