I could talk about Thorpe's Fright Nights for ages. I remember when I made a topic about it a while back.
1. There are four mazes scattered around the park at Halloween. They are walk-through attractions where you go round in groups down narrow corridors and through certain scenes. There are live actors in there who do their best to scare you and build tension up. Also other effects in the mazes include strobe lights, loud noises, air blasts and themeing that you walk through like sheets. Also Hellgate has a rotating tunnel that you walk through.
Now a little run down on each of the mazes...
Asylum: This is the best, most action packed and intense maze every year at the park. It's located opposite the Carousel in the building next to Infernos shop. It's themed to a mental Asylum where all the inmates have escaped and are let loose on you. This maze mostly consists of chicken wire fencing. Disorientating strobe lights and a loud continuous air raid siren. It also has the best ending of all the mazes and sends almost everyone running out the exit only to be laughed at by spectators.
Hellgate: This maze started off as the weakest but has improved massively over the years. It's themed to an old gothic manor with dimly lit corridors and actors using the shadows to appear and disappear out of nowhere. It's housed round the back of the X:// No way out building by Slammer.
Se7en: One of the newer mazes themed to the seven deadly sins. It's inside a tent that goes down the length of the arena. Like the name suggests it contains seven scenes with each being themed to a different sin. It's one of the weaker of the mazes but has improved quite a bit each year.
The Curse: Only opened last year and is located in the beach area by Rush. It's one of the best themed mazes out of the four and is themed around an old ship. It's pretty good and not too intense but has some pretty unique and sudden scares. It just needs a better finale to send everyone running out the exit.
Hope that helps. So the mazes are basically...
Asylum: Intense, action packed maze with strobe lighting.
Hellgate: Dark corridors and creepy scenes with actors using shadows as advantage.
Se7en: Themed to the seven deadly sins. It's the most disgusting and gory maze in Thorpe.
The Curse: A mixture of all the mazes elements put into one. Quite new so room for it to improve each year.
2. Chessington Halloween (Hocus Pocus) is ok. They light up all the rides at night and fill Vampires tunnel with smoke which is pretty cool. They also turn Hocus Pocus hall into a tame walk-through. There are also quite a few photo opportunities throughout the park.
Hope that answers all your questions. If you've got any more just ask as I'm really into Halloween events and haunts and know quite a bit about them (even made my own one year).