I know this thread is older, but thiught I’d respond anyway.
The message “If the pp’s are above 5 after October 2016, then there could be a 20-30 per cent shown increase” would be from the Haematology Laboratory. They’ve probably changed their analyser (machine) that they use to do the blood tests on. The other option is that they’ve changed their reagent which is the substance that they add to the blood sample before they put it in the analyser. Usually if this happens and it makes a difference to the results then there will also be a change in the laboratory normal ranges. In this case it looks like the lower and upper ranges might go up by 20-30% . Hope this helps.