Removed visibility:hidden from sr-only mixin as causing screen reader to ignore
Removed visibility:hidden from sr-only mixin as causing screen reader to ignore

dvla/vrm-retention-online,dvla/vehicles-online,dvla/vehicles-presentation-common,dvla/vehicles-presentation-common,dvla/vehicles-online,dvla/vrm-retention-online,dvla/vehicles-online,dvla/vrm-retention-online,dvla/vehicles-online,dvla/vrm-retention-online,dvla/vehicles-presentation-common