I'm slightly confused by this. I didn't see it early enough to catch the £2 charge, and £6.50 is rediculous.
But, "guaranteed entry"? Why does that sound like you don't really have to book at all, just be prepared to be turned away if you turn up late... That's what it sounds like. :S
EDIT:
I just read a post a while back which answers my question, I think?
"Fright Nights is back and even more terrifying than ever, transforming THORPE PARK into a world of twisted insanity!
Annual Passholders can brave Fright Nights for FREE between the 12th - 23rd October, just show your Pass on the gate as usual.
However due to extreme popularity, Fright Nights during Half Term week (24th October - 1st November) are STRICTLY ADVANCE BOOK ONLY. No admittance to the Park without a valid pre-booked ticket. "
Suggesting if you WANT to, you can pointlessly book for the says outside of half term, to guarantee entry?
The fact that you can't print these at home is disgusting.