Wasn't late openeings a mini event a couple of years ago (in 2004 I think) or it was planned but got cancelled due to low numbers?
I think you're on about the late night opening on certain days in August in 2004. I've got the 2004 map here it says;
1th,14th,21st,28th August 2004
Park open until MIDNIGHT!
Well this is going to be another success for Thorpe and am looking forward to hopefully going then! yay! But on the downside it won't be dark until later in August so no riding Stealth or anything in the dark!
Hopefully Alton will follow and do the same!