Sir, I'm Jon, a/k/a Seldom Seen Slim, the fellow that owns landracing.com. We've often been faced with the potential issue of someone posting images that haven't properly been approved or received permission for posting. As the owner -- there's little that I can do without requiring that each and every image be passed through me for vetting before it appears on this site. I have frequently asked folks here to at least give attribution when posting, and have a few times had to resort to banning those "members" that do not give credit, at least. (That issue has been more evident with print than images, but the precedent does exist).
Many of the professional photographers whose work appears here have taken for watermarking their work before releasing it to any site - whether their personal web page, or here, or anyplace, so that they will not only receive credit via the watermark, but also so the image will be of lesser quality if it is indeed "stolen". I urge you to consider doing the same with your fine work.
I apologize for the appearance without your permission of your work here. I hope you'll consider offering further images from your collections to us - but with appropriate cautions on your part. We do have a gallery of photos, and would consider having your stuff appear there - again, with your copyright prominently displayed.