Dazmondo77 Thank you for your assistance. It is much appreciated.
As per your post, I have exported to .PDF using the Europe ISO Coated FOGRA27 and you will find that ALL colour output results are correct in the .pdf that has been generated.
It also passes the Acrobat Preflight for the chosen Profile which we use for CMYK Commercial printing.
This would suggest that the colour Profile that I am using for the Export is correct and I would therefore expect the colour Profile to be correct when using the Print dialog.
I do prefer to use the Print Dialog within the Affinity software when creating Hi Resolution .pdf's for Commercial Printing but find that the results are not as accurate as one would expect.
Screen capture attached shows the results of exporting to a .pdf.