I was looking for the same information. The article has a link to pdf with a more deep discussion of this case, and the explanation and the values of the weight of each product. http://people.maths.ox.ac.uk/richardsonm/SignalProcPCA.pdf
From the figure 4, after rescaling and rounding the coefficients
From the figure 4, after rescaling and rounding the coefficients
The pc1 that separate N Ireland is approximately:
The pc2 that separate the other three countries is approximately: