Vekoma Boomerang! and IntaminFan your partialy right Oakwood is in the UK but not actulay in England, its in Wales but still i wouldnt have expected you to know that. And as of yet i havnt been to Oakwood to check out Megafobia but as said it does look pretty cool, and was voted one of the best coasters in the world. But really Oakwood has 2 big rides (Megafobia and Hydro) and i suspose the space shot they have, and personaly for me its a 6 hour car ride (long time in the UK [;)]) so its really out of range. Although i hope to get there sometime in the next couple of years.
And there is also Lightwater Vally up in Ripon, which has Ultimate 'The Worlds Longest Coaster'
(btw incase someone doesnt get that and trys to be smart informing me The Beast is longer... I know, just Lightwater Valley claim it to be the longest) and theyve also got one or two more rides there which are more for kids