Hi Jerry
I'm not really sure how much the "creamier" taste had to do with the extra carrot or pepper although I'm quite sure that the additional sweetness came from these two ingredients. Although, these probably did thicken the gravy somewhat, I suspect it was the floury potato that played the largest part. As SS correctly pointed out, this was non conclusive and can only be confirmed after my next batch when I revert back to waxy salad spuds.
Regards
SnS ;D