By Tim Hanlon Alex Batty will today achieve his “biggest dream” as he starts college after going missing for six years. A criminal investigation has been launched into the teen’s abduction, who was found last month in France six years after his mother and grandfather took him on holiday and never returned home, Greater Manchester police said. Both adults were prohibited from being with the boy at the time due to domestic difficulties. Last month the 17-year-old returned to Oldham and was reunited with his grandmother Susan Caruana — the legal guardian who had made frantic and emotional appeals…