Postal votes are great and all

But this seems to be an inherent contradiction:

I declare that, before the close of the poll, I showed the unsigned postal vote certificate and unmarked ballot paper(s) to the witness; signed the certificate in the presence of the witness, marked the ballot papers and fastened the ballot papers to the envelope

I checked and this is the only certificate to sign. So I have to sign to declare that I...signed the declaration??

Anyway: the toddler sized paper was easier to fill in thanks to cluey voter.