John says on 7/Jan/12
I think he seems taller - or is british people just generally short?

Godred says on 9/Dec/11
5`9 seems right.

John says on 28/Jul/11
Rob he needs a upgrade, every show or tv program he does, he is almost always taller or as tall as the other people appearing there. He really looks 6ft, but since he claims 5'10 himself, he must be using lifts. He must be 5'10.

John says on 25/Jul/11
I thnik this needs a upgrade Rob, look at the videos with him on youtube, he looks tall, check out "An evnening of wonders" for example, every person that is randomly pulled to the stage is either shorter or as tall as Derren, another example could be Derrens show "The Heist", none of the many people in that show is taller than Derren it seems, and there are many other examples, I only remember seeing one video on youtube where he does a trick on a person who is quite taller than him. But since he says himself he is 5'10, he is probely not taller than that, so maybe he is a major shoelift wearer as jamz0 wrote. But he does need a upgrade to 5'10 for sure I would say.