Today WB did a news release that they've brought the Hogworts Express to the London Studio Tour, and made a Platform 9 3/4

The Warner Brothers Studio Tour London will have the train in the tour on March 19th for it's new Platform 9 3/4s

Full Press release at http://www.wbstudiotour.co.uk/the-tour-experience/whats-on

for a full look at the Platform 9 3/4 tour:

They had the Knight Bus for the 2010 grand opening at Universal

top and bottom images from http://www.insidethemagic.net/2013/05/closer-look-diagon-alley-secrets-sizes-details-and-dragons-revealed-for-harry-potter-expansion-at-universal-orlando/