Is this Japanese knotweed?

Is this Japanese knotweed?

Observation - Is this Japanese knotweed? - UK and Ireland. Description: Found this coming up under the fence in my back garden, I've compared it to images of Japanese knotweed online but I'm not sure that it is the same as it has a red tinge to the leaf. Any suggestions as to what it might be would be much appreciated.

Found this coming up under the fence in my back garden, I've compared it to images of Japanese knotweed online but I'm not sure that it is the same as it has a red tinge to the leaf. Any suggestions as to what it might be would be much appreciated.