Just before the interval, Ponty flanker Nick Kelly was yellow carded following a brawl and from the resultant penalty Hayes cut the gap to two points.

BBC: Pontypridd stay on course

However, Vaughton infringed at the resulting ruck, receiving a yellow card for his troubles, and Lamb ensured the Ospreys only led 12-9 at the interval.

BBC: Gloucester 26-18 Ospreys