In reply to Gordon Stainforth:
The last one (3rd, by my counting, not 2nd) is fine, though I'd bring the
end back on the other side of the part leading into the initial wraps.
It might be "wrong" as *the* Tarbuck knot, but it seems a better,
more secure way to tie off the end (the coils are the effective component).
That other knot-blog site OTOH has some mistakes; I think it's copying
one of the Budworth books (images & text), which e.g. got the wrong loading
of the Icicle Hitch.
*kN*