I think this is a grey area!

while your driving it then techincally yes BUT if you park it somewhere on the road then probably not (imagine if it rolled off or something draft!).

Also remember mobile cameras not only check for speeding but also check to see of the car has insurance/tax/mot. This car would be picked up as having no insurance and it could be difficult to prove it acutally did!

I have asked the DVLA and insurance companies about this and never been given a straight answer. In my mind if stopped while driving I would say your OK but be prepared to prove it in a court of law!