The Saints hadn’t been beaten at home in the compeititon since Biarritz Olympique took the honors in the Midlands back in 2007 but Nigel Davies’ men got off to a flyer and never looked back.
Full back Liam Williams crossed for the game’s opening try after two minutes, which Priestland converted as the visitors made the most of a blindside move.
Ryan Lamb landed a penalty after 18 minutes, but there was drama from the restart. Priestland kicked high and deep into the home 22 and Scottish wing Sean Lamont chased and jumped to tap down ahead of Courtney Lawes for the Scarlets second score.
Priestland was inch perfect with the touchline conversion and there was worse to come before the half-time whistle. Two more Lamb penalties cut the deficit to five points and now more pressure was coming from the home side.
But a sky high bomb from Priestland was dropped by Samoan international George Pisi, who was drafted in at short notice to replace the injured Ben Foden, and George North and Jonathan Davies snapped up the loose ball to create a try for replacement back row man Matt Gilbert.
The conversion was no problem for Priestland and the Scarlets were flying at 21-9 at the break.
Priestland crossed for the bonus point try himself after outpacing the covering defence as the Scarlets took full control.
Pisi and England flanker Tom Wood both scored late efforts for the hosts to cut the margin to a mere five points but it was the Scarlets night and they come away with maximum points.
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