So.. after reading this thread, I walked to Tesco (tiny Tesco @ a Gas station) and bought myself a bottle of double cream (good for whipping, spooning and.. forgot!) and prepared myself a UK version of Pasta with carbonara sauce..
Not too bad.. considering that bacon is considerable saltier here than in the US...didn't find parmesan cheese (the one in the green bottle, by Kraft), but I guess the point is that at least this double cream worked out the way I wanted!!
conclusion: UK double cream = US whipping cream (at least for me!)
thanks for the advise!!