In this case the entire sentence has been re-written. As it does not overlap with everything else on all other lines.
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The duty sergeant G.White for some reason has rubbed it out and re-written it. The same for Nevills age also. The logical inference would be G.White felt certain things were illegible or wanted to correct typos.
The rewritten sentence with the misspelling of scene as "scence" is in PC West's handwriting.
The sentence "C A 5 To scence" is in the copy signed by PS G White which shows the sergeants handwriting in the result box and his signature below it. His writing is obviously different to that of West.
You have coloured red additions made by West some time after the log was written, but you have not coloured red the sentence "C A 5 To scence", which you also claim was written by White. At any rate the additions like "illness" (after the word "mental") and "age 62", said of Nevill Bamber, are in the handwriting of PC West.
West's handwriting
Notice West writes some lower case letters as capitals, but smaller. His "e" and his "t" are written like that. Also his "n" is the same shape in both copies. PS G White would need to be an expert forger to fake West's handwriting so well. It would have been much simpler for DCS Ainsley to get West himself to do it.
West must have been asked to write parts of the log again. Perhaps the police were looking for an excuse not to hand over the original log and they thought that producing an improved version with clearer writing in certain places would explain withholding the original which was thought to be below the required standard.
Remember that the reason given for cutting out negatives from from the strips was that the removed images were thought to be sub-standard. It seems like another instance of an old and familiar routine to justify withholding crucial evidence which could prove something once and for all.
The most serious mistake anybody can make about the Bamber case is to assume that that the authorities have been acting in good faith.
Here are the two logs put together by you for comparison. There can be no doubt that West rewrote the parts in red apart from the content of the result box and the signature by PS G White.
