And of course, as you note, this:
This week Begin's personal secretary, Yehiel Kadishai, and Herzl Makov, the director of the Menachem Begin Heritage Centre, in Jerusalem, told Haaretz that they knew nothing of the assassination attempt, which at the time had been played down by both Israel and Germany.
...does not make the story 'disputed', so there is no substance to wchurchill's charge of int'l dishonesty. The world's northernmost desert wind.