The space for Sw8 was just a station and the rest of coaster went into valley, which they wouldnt be likely to do anymore (Would not build another wooden coaster so soon after Wicker Man and other side of ride is where '13' is now placed)
The area beyond Galactica seems like an odd choice as its a car park next to a hotel, they are already short on car park spaces.
They wouldnt build on the coach park behind the aquarium as its too near residential property and still used as a coach park.
Coaster corner was scrapped in the 90's due to proximity to property / too much noise, so again unlikely.
Doesn't leave a lot of options...