That's the fella - Erich Westersoetebier!! In the 1970s he appeared to be the unofficial 19 Sqn photographer and when they knew he was on the Bailly Bridge over the Emms they used to 'pose' the Lightnings so he could get the right shot. He even flew in their T bird a couple of times, so he was in a very fortunate position. I think he still lives in the same farm - I'm only surprised he's never made any money out of his massive photo collection.
....and he is still collecting slides.
maybe of interest for some of you: there is a "new" website about RAF Gutersloh with a lot of photos (also many from erich):
http://www.sg-etuo.de ...the site is in german only but maybe the google translation link will help you. we are always looking for input for our site (photos or stories).