One of the best roads in Essex, that I keep happily returning to. Either direction is great, loads of tight bends and (relative) straights inbetween to set-up for next corner. Good learning ground, few villages you have to slow down for, gives you a break from concentrating hard (check yourself), but not too many to ruin the rhythm. If youre coming up from London, try the B184 before it, thats fun too.
thatchauhan