The Historic England website has a nice 3D laser scanned model of the wood, as well as an archaeological illustration in which you can see the "intentional cut-marks".

[historicengland.org.uk]

And I think this "intentional cut-marks", is an important phrasing since the word "carving" can conjure up the connotation of creative art. It could well be that the cut marks were purely decorative (apparently reminiscent of decoration on early neolithic pottery), but we have to accept that it is merely a conjecture that the marks are 1) intentional and man made, and 2) decorative rather than utilitarian.

Jonny

The path to good scholarship is paved with imagined patterns. - David M Raup