Bath have trounced London Irish, who played the majority of the match with 14 men, 45-14 at the Madejski Stadium this afternoon.
London Irish had Brendan McKibbin sent off with an hour of the game remaining in a feisty contest that also saw two yellow cards.
Priestland grabbed the conversion from out wide to take an early 10-point lead, but Bath found themselves down to 14 men after Alafoti Fa'osiliva was sin-binned for a high tackle.
The ill discipline continued and Irish scrum half McKibbin received a red card after he was deemed to have stamped on Henry Thomas.
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Ollie Devoto took advantage of the broken field to smash through midfield and score for Bath, as replacement scrum-half Scott Steele finally sniped to get Irish a score with 13 minutes of the half remaining.
Shane Geraghty added the conversion, before finding himself on the end of a late tackle by Devoto which earned the centre a yellow card.
The win sees Bath move up to fifth in the Aviva Premiership, with London Irish sitting just above the relegation zone in 11th.