Censor numbers on mail from Canada

I have only just got into this topic as an extension of my KG6 collecton of Canada. At present I am limiting myself to mail from Canada. I have many questions but a couple for now I am sorry if these are very basic.
As far as I have been able to find out a lot of mail from Canada to Europw was censored in either Trinidad or Bermuda using English censor labels (I hope that is corect) Is there a source on line for which censor numbers were used where. If no online source is there any published literature other than
British West Indies etc. - Burrows (2010)
Canada & Newfoundland - Burrows (2010)
which I plan to get
In the UK PC66/PC90 Examiner Numbers Database in this forumn what do the numbers in the first column represent Are they just an ID number not related to the censor numbers
Also the second column is called labels / tape. Is there a source to show what these are, perhaps the books above ??
John Cranmer
As far as I have been able to find out a lot of mail from Canada to Europw was censored in either Trinidad or Bermuda using English censor labels (I hope that is corect) Is there a source on line for which censor numbers were used where. If no online source is there any published literature other than
British West Indies etc. - Burrows (2010)
Canada & Newfoundland - Burrows (2010)
which I plan to get
In the UK PC66/PC90 Examiner Numbers Database in this forumn what do the numbers in the first column represent Are they just an ID number not related to the censor numbers
Also the second column is called labels / tape. Is there a source to show what these are, perhaps the books above ??
John Cranmer