Advice on hilly training loops kent way please

I live by the Dartford bridge on the Essex side and need to get some more graidents in during my traiing. I was thinking of nipin over the water to Kent. Can anyone recommend some 30 and 50 mile hilly loops please, as I am doing the horns in just over 7 weeks... Ta
Mapmyride links always appreciated
Brett
Mapmyride links always appreciated

Brett
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This was the route a few years ago;
http://www.bikely.com/maps/bike-path/101164
For longer steady climbs, a bit further west you could make a loop of using Toys Hill, Ide Hill, Cudham Lane South and practically any other road in the area.
You could try this one which takes in Toys Hill and Cudham Lane. Just under 64 km.
http://www.mapmyride.com/routes/view/3271213
Give it a go - you'll enjoy it.
Let us know how you get on.