I helped build the hoverport in 1978-9. Was there for the topping out, and the first test flights. It has been demolished now. :o(
There was also a monster French built hovercraft, L'ingénieur Jean Bertin, which used the port.
They were all as noisy as fuck. If the wind was blowing the wrong way, you could hear them in Folkestone, seven miles away...
They also wallowed like pigs. There was a reason every seat had a sick bag. Also, piss poor view out of the windows.
Great on a calm day though. Good for 60MPH+