You will find a few handy links explaining how to deal with tickets on my web site:
http://www.drivesmartbc.ca
Of particular interest to this thread:
1) The officer is not required to write the speed on the ticket. It goes in the ticket notes.
2) The MVA requires that the JP impose the fine legislated for the speed being travelled. If they find between 20 and 40 over, for instance, they must impose the $196 fine and cannot reduce it.
3) Down near the signature block on the ticket you will find something to the effect of "shaded areas of the ticket do not form part of the offence charged." This means that the gray boxes are not required to be completed and failing to do so is not fatal to the ticket.