The Tiger Moth Missions are T/O - follow wapoints - Land and the third one is navigate to and from Stonehenge. You just move on to the next mission as far as I could tell.
It might be worth looking at the original Spitfire Dawn thread for more info. You will also find a link that Adonys has provided to download his ammended version as a Campaign rather than a sequence of single missions.
http://forum.1cpublishing.eu/showthread.php?t=22953