There is actually a one-shot/special comic written by Stephen Sommers that connects Van Helsing to...Van Helsing. No, really.
Apparently, he stops in London before heading back to Rome and battles Dr. Moreau. Apparently, he was there at the same time that Mr. Hyde was. You think that this would bear mention in the film, but you'd be wrong.
*source: Wikipedia and bigger nerds than I.*