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As noel suggested it could be the radio head unit is faulty and draining too much current.
Not sure if you can on the Espace, but may be worth checking the connections to the radio.
To really nail the problem down, turn the radio off and leave the ignition on. If the car starts after 5 minutes, you've got your culprit.
Currently in dave_mezza2006's garage:
2014 Vauxhall Astra Limited Edition 1.4 16v VVT Turbo