Is there meant to be a runway in that picture though!? I certainly cant see it!
There are two, the farm strip & an RAF base
To find the farm strip follow the disused railway that runs from the bottom right. About 3/4 of the way up the picture you'll see a building with a white roof (food processing plant) just to the left of the railway. Go right, just over the railway and there is a field that looks like a diamond shape, sqashed to be long & thin, and canted at 45degrees bottom left to top right. The instructor was actually being truthful as well as flippant, there is a single tree on the right-hand side about halfway up the field.
The RAF base is on the very right hand edge, follow the wing strut up, and then the vertical strengthener. Just where it dissapears off the picture there is a dark grey patch, that is the sothern end of the runway.
If you want to confirm what you've found, I've put a larger version
here with annotations to show you, and a close up of the farm strip
here
Don't worry about not being able to see it in a photo, it's easier when you're moving around.