100% correct Micks.
At the last BWP training day there was an exemption for MX tyres because it was also a come & try day for the Baulham Hills Minikhana club and that also included several of the fathers along with my son Tom.
I personally don't have a problem with Knobby's, if you're silly enough to use one on DT then suffer, especially on oiled tracks.
Would you use one on the road?