Did you take into account possibility of a property having more than one line? Which can change the statistics too.
You need to analyse more postcodes to be sure they are trying to cook the books.
Scotland does have some small exchanges that are totally Exchange Only but signs of some work in different areas is appearing, but with any large project the question is who is dealt with first.
Its difficult to quote exact figures due to openreach removing their checker, however I did go through a list of all EO lines in my area, there are 146 in total non inclusive of the farms which will be effected. From memory the story was similar for each section. Now considering the speeds are 1.5Mb - 2Mb I think chances are no one has a second line, there is someone who either has satelite or direct contact with a mothership (perhaps the wee green dot) as they have a huge dish.
A more plausable possibility is that their are un-used lines giving differing results. I cannot envisage anyone having 2 lines with the possibility of max 4Mb (possibly higher).
My speed is 3.3MBs, thats after about 15 engineer visits (those visits enforced my opinion on openreach). max speed I have had is 4.2MBs which lasted 6 months till their was a line fault (which took 4 engineers to find!).
I would love to get my hands on the exact figures.
I dont think they are cooking the books but any analyst will tell you that their are ways to slide figures in favour of your aim. They certainly arent using up to date information, and probably deliberately so.
Funny thing is there are 2 properties in the middle of the cluster that can get Fibre lol, and there are properties within 20 meters of a cabinet that cant get it. They must be raging.
Also regarding our statistics I know for a fact their is one property that doesnt have a telephone line.
On a side note why have they removed their checker?