direct to your inboxFans of the zany ITV singing show The Masked singer are convinced they've worked out the identity of Viking - and they say the clues stack up.The viking character with the ethereal voice is A-ha frontman Morten Harket according to viewers.Fans of the guessing show flocked to Twitter to claim the Take On Me hitmaker is behind the Viking costume.They reckon the clues to Viking's identity all add up to it being the Norwegian singer and songwriter.And mysteriously, Morten's