A mum says she was stunned to find her 10-month-old son had spent £7,807 installing an automatic upgrade on her Tesla to add the self-driving package – and she had no idea until she checked her bankA mum says she was stunned to find her 10-month-old son had spent £7,807 installing an automatic upgrade on her Tesla to add the self-driving package – and she had no idea until she checked her bank