Welsh centre Jamie Roberts - facing Australia for the first time this summer due to injury - has scored the Lions' fourth try, taking a pass from replacement Conor Murray before galloping home.
Halfpenny makes it another seven points, and the Lions start to celebrate a series win.
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A dry night is expected throughout the country. During the early hours clear spells are likely to develop allowing the temperatures to fall.
More than a thousand people gathered for the funeral of Wales international rugby league player Danny Jones in Halifax.
A chef from St Gwladwys Bargoed Primary School has won School Chef of the Year in a National competition