Yes it would be useful to have carbs on the front but at least you now know it has to be on the pack .
Personally I would rather it was per 100g than per serving because serving sizes can differ enormously . In the US they use serving sizes and manufacturers are reputed to have a tendency to base them on very small portions. As a percentage it's reasonably easy to compare.
NHS conspiracy to keep people unaware? It doesn't appear that way. The evidence suggests somewhat the opposite.
. Two years ago the UK government had a consultation about front of pack labelling. This was being done on an ad hoc basis ie different manufacturers had introduced it and there were several different versions not all were comparable. Many organisations, including parts of the NHS, food manufacturers health charities and individuals responded. (see p36 of link)
The government summarised the findings of the consultation and responded.
Respondents supported FoP labelling and wanted its use extended. There was a request for carbohydrates to be included in FoP for those with diabetes ....
It is not possible to include carbohydrate in FoP labelling as the format of FoP will be specified by Article 30(3) of the EU FIC from December 2014. This states that only the energy value or the energy value together with the amounts of fat, saturates, sugars and salt may be repeated on the front of food packaging.
https://www.gov.uk/government/uploa...response-nutrition-labelling-consultation.pdf
The labelling for front of packs is still voluntary and many International companies(about 40% of food sold in the UK) have declined to implement this system in any case and will stick to what has to be there by the new EU law (their labels are read in many countries)
So you may be able to blame European legislation which was originally aimed at increasing information throughout Europe . I'm sure that it would be possible to find the papers leading to the European decision. I do know that they have greatly strengthened the rules .Many junk type foods like chocolate biscuits and bars and crisps were able to get away with no labels at all as they were classified as confectionery rather than foods. Others used to print it so small that you couldn't read it (there is now a minimum size)