Band treat fans to the 'heaviest single we've ever put out'
Plain White Ts and Framing Hanley also set for June festival
Young Guns and King Blues will also play Liverpool event
Welsh band's fifth album to come out on March 14
Band filmed show at O2 Shepherd's Bush Empire last July for release
Band will begin the shows in Aberystwyth on March 16
Welsh group will play shows in Reading, Swansea and Leicester in November
Welsh group will perform their debut album in Cardiff and London in July