Ok so the EA has got back to Thorpe and they are withdrawing their third objection:-
https://docs.runnymede.gov.uk/PublicAccess_Live/Document/ViewDocument?id=A9AD7DB3E5854B9686F139BE08E3D049
Objections 1 and 2 still remain, however. The only way these could be overcome would be to build the coaster elsewhere in the park which obviously won't happen, especially considering much of the park already lies within floodzone 3b. So now we just have to await the council's decision, whenever that may be.