Wow Rosco that has me surprised! I have researched on here and other forums and never heard that! Well done! I will try a few next time, I have some of them, Sandworm nerisis I think in Blood red colour. Be interesting to hear if there is any difference to getting them on plastics in Rivers compared to open water/beaches.
I would still use the naturals as last two times I have fished them I have bagged out on them, but my back reminds me for a few days!!
Cheers
Flatzie