What I found is that written evidence for knocking on wood (and for the history of gesture as a whole) is remarkably sparse. In the Penguin Guide to Superstitions, folklorist Steve Roud offers a skeptical take on the provenance of knocking on wood due to the near total absence of written records about it:
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Tyrrells was founded by Herefordshire potato farmer William Chase in 2002, with the crisps made in a converted potato shed in his father's potato farm in Leominster.