I was interested to read in a recent edition of British Wildlife Magazine about a new treatment for knotweed.
We invented this method for ourselves in a quite casual way about 5 years ago, and, after initial success, have continued and found it extremely effective.
It was interesting to see the method refined and the results of tests concurring with our ad-hoc results of 'very good'.
Because the British Wildlife describes the whole process in exhaustive detail, and accompanies it with all the essential health and safety advice, I will not attempt to plagiarise them here, everything being available on www.britishwildlife.com.
Read it and use it!