Former judge of 'The Voice' also speaks of his love for James Bay and Bruno Mars
Pre-sales allow tickets to be purchased before going on general sale
Welsh singer vents his anger after apparently being dropped by the talent show
Rugby bosses have been urged to stop the 1968 hit from being sung at games at Cardiff's Millennium Stadium
Welsh Rugy Union asked to rethink use of 1968
Iommi revealed the idea started as a joke
The veteran singer will appear at London's Hyde Park on July 13
Veteran crooner also says he's keen to do a second series of 'The Voice'
Singer will return for series two - so long as he can approve the other coaches