How strange! How did they know it was "overdue"? Was a flight plan filed? On a flight from Cambridge to Lydd? Surely not. Did a friend raise the alarm?
I can understand an aircraft disappearing in mid-Atlantic. On the Kent coast - no not really? Did it head out to sea and then get into trouble?
Hopefully the pilot decided it was a lovely day and is enjoying a night out in France oblivious to all the fuss back home.