Looking at that again, I suspect there are some interlacing issues I need to sort.
It definitely like it's interlace video that's been captured and treated as progressive.
I've done a lot of tape digitising over the years, the key is to always capture as 720x576 25fps interlaced, which is full resolution digital SD.
For sharing the clips (e.g. uploading online), it's best to stick them in to an edit application which is using a project set to 720x576 50fps, and then export using whatever your prefered codec is (I use H264). If you're dealing with 16:9 footage you will want to set your project aspect ratio as 16:9 and then export as 1024x576. I use Adobe Premiere which works really well for this as it has a decent deinterlacer, but I'm sure most professional edit applications will give similar results.