London to Whitstable Route

I was just replying>

I was under the impression that cycling is permitted on A roads.

Unless a BIG SIGN says it isn't (as is the case in the Blackwall Tunnel and other stretches of A roads).

I too have ridden by mistake through there but was able to get away. Also lead 11 riders over the Dartford Crossing (motorway), that was a laugh.

This was the annual route I lead on here for six years. It is similar to your first link but cuts off the main road at Green Street Green, goes up an over Ilstead Rise and down a few hundred meters of (23c doable) farm track. I just think this is more pleasant.

Also you can ride the bike path across the M2 motorway at Rochester. The riding surface, and view are better than the next bridge along.