Re: LC12 - B&M 'Wing-Rider', Thorpe Park 2012
Well "construction starting" will probably mean clearing the area, landscaping and getting the foundations and footers sorted that's what usually takes the longest time. I wouldn't expect any vertical construction until September or October. Due to the size of the thing, if they make it look somewhat impressive for the Fright Nites it'll act as a massive advert itself.
Remember with Stealth, the tophat was complete for the end of October. Getting the lift hill complete by the same time will surely get people going "ok we must come back and ride that when it's complete" as it'll be an impressive size.