After April 2009 an importer can 'volunteer' their RV for inspection, why would anyone want to do that
The existing rules (to April 2012) allow an RV upto 2.55m including accessories in that total.
If your RV is wider than 2.55m and especially if you have an awning, they can refuse to register your vehicle.
BUT, if you pay their fees and voluntarily submit for testing I believe you are then working to the new rules (even though they don't officially start until 2012) and are allowed 2.6m and awnings are exempt.
Although VOSA told me they would be "surprised" if an RV was declined before 2012, they said it could very well happen. You know how one hand doesn't know what the other is doing. :'(
By submitting to the test you are 100% assured that your RV is legal - there are NO grey areas at all.
Having said all of that, I wouldn't want my newly imported RV to be their training manual. I would wait until the RVOA etc have had a chance to see all the ins and outs of their testing procedures first.
Finally, please don't take my comments as being Gospel. I will write what I believe is happening after having spoken with VOSA etc. I could have misread something they've said. However, I do try to get it right.
Paul