UPDATE 3-EDF delays Flamanville 3 nuclear project again

* Reactor seen starting production 2016 vs 2014 previously

* Production chief says confident this is final delay

* Costs now seen at 6 bln euros vs previous goal of 5 bln

* Flamanville is key project as EDF vies for UK deals

* EDF shares up 1 pct, French power prices edge higher

(Adds EDF executive, UK background)

By Marie Maitre

PARIS, July 20 (Reuters) - EDF has delayed the completion of its first French next-generation EPR nuclear reactor by another two years to 2016, saying it expects the project's costs to rise to 6 billion euros ($8.52 billion).