According to statistics, Thanet may be overdeveloped.
Admittedly that's not the official line but it hard to see how else the figures can be interpreted.
A new BBC page, "How much of your area is built on?" shows that Thanet is heavily developed.
According to the page, Thanet has less than 1% of land in a natural state compared to the national average of 35%.
Likewise, 27% of Thanet is "built on" compared to less than 6% of the UK as a whole. To give that some perspective - before this value doubled twice, Thanet would be 100% buildings. Dover, by comparison, is only 8% built on. Canterbury 9% (with 16% of land still in a natural state).
The only comparable area for buildings is Medway (which contains Rochester and Gillingham) which is 28% built on but still with 10% natural land.