the boy 's mother frantically tried to open the door when the keys to her range rover were locked inside and the eight-month-old boy was stuck in the car alone as temperatures hit almost 23c yesterday .
she grew increasingly distressed as the car became hotter - with no fresh air inside the vehicle - and called police for help .
the second hottest day of the year so far beaten only by today when temperatures soared in the capital to nearly 24c .