If so then do take care won't you? From what i have read recently, the Police are taking a special interest in vans which may be exceeding the speed limit. Now not a lot of people know this but if your van is not of the car-derived variety and it is plated at 2000Kg or more,then it is subject to commercial vehicle speed limits as decribed here (vehicles upto 7.5tonnes)
http://www.highwaycode.gov.uk/09.htm#103
Therefore, for instance,you could be happily bobbing along at 60mph on a single carriageway road which is posted as having a 60 limit,and you could get a ticket becuase you are limited to 50mph in the kind of vehicle as described above.
Examples of vans which are over the 2000Kg limit would be something like a transit connect and up..AFAIK