First pic: Plant in foreground looks like a dock of some kind, out of focus background plant looks like Japanese Knotweed. A better photo is needed though sorry.
Second pic: Too small to tell sorry but I assume it's the doc plants again. Definitely not knotweed though.
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Whatever it is, it is not Japanese knotweed.
If you live in Derbyshire, as I do.
I have seen JKW ... it doesn't look like it to me
Gardening in Central Norfolk on improved gritty moraine over chalk ... free-draining.
Her are some pictures - https://www.google.co.uk/search?source=hp&ei=SrARW-3JDOHi6ATtuIrYAg&q=Japanese+knotweed+images&oq=Japanese+knotweed+images&gs_l=psy-ab.3...2235.10227.0.10406.0.0.0.0.0.0.0.0..0.0....0...1c.1.64.psy-ab..0.0.0....0.47Ic-6uO2YU
"We don't stop playing because we grow old; we grow old because we stop playing." - George Bernard Shaw
If you live in Derbyshire, as I do.