Reluctantly went to the dealer today and bought a new genuine Greenfield belt. Also confirmed whilst there that the "rolled" belt was the correct one and in fact it was also a Greenfield belt.
Asked what causes it to roll and was told it is generally due to lack of tension. It seems this dealer does not rely on the "automatic" tensioner fitter but sweats up with a lump of wood against the tensioning pully to get a few more notches on tensioning ratchet rod!!!!