Llanelli Scarlets team manager Anthony Buchanan:
"We set our stall out with the intention to go and play and this week it paid off for us.
"First half we spilled a lot of chances and it looked as though Leeds were still in the game at half-time.
"We stepped it up in the second half and scored some nice tries, but Newcastle next week will be tough."
Leeds Tykes: Balshaw; Rees, Jones, Vickerman, Biggs; Ross, Marshall; Kerr, Bulloch, Gerber, Hooper, Morgan, Dunbar, Parks, Crane.
Replacements: Isaacson, Rawlinson, Murphy, Thomas, McMillan, Stimpson, De Marigny.
Scarlets: Byrne; James, Watkins, King, Selley; Bowen, Peel; Thomas, Gravelle, J Davies, Afeaki, John, Easterby (capt), Mills, Popham.
Replacements: R Davies, Hawkins, Wyatt, Quinnell, L Davies, Hercus, Daniels.
Referee: Tony Spreadbury (Bristol)