Halfpenny kicked another nerveless three points, after the Lions earned a further penalty at the scrum.
When the Australian forwards couldn't live with the Lions at scrum time yet again, prop Ben Alexander was sent to the sin bin.
Halfpenny again made no mistake, to extend the Lions' lead to 19-3 after 26 minutes.
More top news
All very dull and grey over the next few days unfortunately, but at least temperatures are degrees milder!
Conservatives claim the poor PISA ranking is a 'scandal of monumental proportions.' Plaid Cymru say the Welsh government has 'failed again.'
Unions are calling on the Welsh Government not to panic and to provide support for teaching staff following the PISA rankings publication.