No problem Steven. I would go with the scud sucker classification there which is a slang word for a piece of scud caught in a local area of vorticity. I have been very fortunate to see half a dozen funnels in just over a year from here and I can say, based on my own experience, that you will know one when you see one because your'e heart will be pumping. They look very dramatic with strong rotation, just like a tornado suspended in air (that's what they are) . When that happens you won't be asking if you have seen a funnel, you KNOW yourself you have one. That's the best way I can explain it. I'm sure John would agree to.
Here's a youtube video of a tornado over N. Ireland retreating into the funnel stage shot through a car windscreen during a t-storm. This is a good example of how substantial these things are in the flesh, especially the big ones.
Here's another video from England which is an excellent example of their substantiallform and rotation...
Hope this helps Steven.