Also sorry for my ignorance but what is an F700 and why is it so important ?

Form 700 contains the servicing and flying records for each aircraft. The pilot signs for the aircraft in the F700 before walking out to check it and take off. He signs the F700 when the flight is complete, entering the flying times and any problems he encountered. The ground crews enter the servicing that they have completed on the aircraft and sign the F700. Therefore its a complete history of what has happened to the Airframe.