Living Vans

Making lots of enquiries to DVSA about the "Living Vans"  The only answer I have been getting quotation from the MOT Testing guide A2.4 page 13. And Living Vans are not exempt from MOT testing ! Before I retired from VOSA ( DVSA now) I used the deal with the Travelling-gypsy peoples vehicles. Classifying their vehicles ! Is it a Caravan...Living Van ...Motor Home...HGV..Class 7..Class 4 .....? even the managers at the technical section had different ideas.Nightmare for me was a vehicle tested as a Motor home one  year , next year same vehicle turns up as a HGV because the owner was selling bottled gas from the vehicle. So guys , any of you tested-dealt with a Living Van ?