My passenger took this photo on Sunday. I was a little surprised as no microlight site is marked here on the CAA chart. On Google Earth one can see what looks like a short runway with a small plane or microlight taking off.
The position is 51°42'17.20"N 0°16'36.76"W (less than half nautical mile SSW of the De Haviland Heritage Aircraft Centre, near Potters Bar)