We wanted to know where in southeast England are authorities planning to build a giant statue of a white horse?

The answer is Ebbsfleet -- which is in the county of Kent.

Ebbsfleet

Lots of people will drive past the giant white horse on their way to London. By the way, Ebbsfleet is also the location of a major international railway station.

It's used by those high-speed trains that connect London to mainland Europe via the Channel Tunnel.