Something I noticed was those 60's shots seemed to be only numbered up to 12 so I'm guessing the photographer was using 120 film at the time as my first camera back in the early 70's was an ancient handmedown Agfa Isolette with folding bellows using 120 and I have a vague memory of the film only holding 12 pictures. The 80's ones numbers seem to go higher so I'm guessing the photographer had by then transitioned to a 35mm SLR camera. Given that, I expect those 120 format shots to actually be really detailed when blown up.
But there are some lovely little details in among those pictures. There's quite a few shots of coal lorries going about on their business and a wonderful shot back in those 60's ones, forgotten where at the moment, of a lorry with two lads perched between the sacks on the back being driven along. H&S would have a fit at that these days as well as the Police.
But yes, as you say, I expect many of the shots are to capture the scenes before demolition happened or as in some scenes, was completed, and hats off to whoever it was who had the gumption to do it before it was all gone and only in peoples memories.
I'm still after a decent photograph of Kemlyn road that will have my Nans (& Grandads) on my Dads side house that I used to go to in the late 50's and early 60's, clearly visible in it.