In reply to Tom Randall - Lattice Training:
> Whatever happens ALWAYS blame Andi Turner. That's my motto for life.
And especially appropriate in this case, since Andi did write that section of the guide. In his defence, it is mentioned in passing in the description of Skydivin', and it does also get a bouldering grade (V5, and it's a roof crack - so it would hardly have detained Pete and your good self by more than a few seconds...)
It seems to have first appeared in Gary's edition: "The short roof crack between Lightning Crack and Teck Crack has been climbed at E3 6a, reputedly by Joe Brown".
I'd take refuge in the 'reputedly' if I were you. If you had to climb every problem 'reputedly' climbed by Joe, the challenge might take a bit longer.