@Fab Foodie , your route back is pretty much spot on, though on leaving Southend we turn right at the end of the cycle path and climb back up the hill to the A13 and just followed that to the mad and bad Benfleet RAB. I noticed you rode around it, next time, look for the cycle path on the right hand side that circumnavigates the RAB, Much safer. Your route after the ferry at Gravesend is pretty much spot on copy of the FNR route that included the canal path, bit bumpy that.