Scarlets maintained their unbeaten streak over London Irish and firmed in their place at the top of Pool three when they beat London Irish 27-19 at Parc y Scarlets.
The Scarlets have now won all 22 fixtures against London Irish throughout their history of encounters with the English club - dating back their first-ever game in December 1908.
London Irish were never quite out of the match but the final result was settled by Vili Iongi when he scored his second try in the last minute.
Ealier in the match Deacon Manu scored the Scarlets second try and full-back Dan Newton converted all three tries and added a penalty.
Topsy Ojo's second half try and Tom Homer's four penalties meant that London Irish were always in contention even though they were trailing.
Final Score Scarlets (10) 27 London Irish (3) 19
Tries: Iongi (2), Manu
Cons: Newton (3)
Pens: Homer (4)
15 Dan Newton, 14 Viliami Iongi North, 13 Gareth Maule (capt), 12 Adam Warren, 11 Andy Fenby, 10 Aled Thomas, 9 Rhodri Williams, 1 Iestyn Thomas, 2 Emyr Phillips , 3 Peter Edwards, 4 Adam Powell, 5 Dominic Day, 6 Mat Gilbert, 7 Johnathan Edwards, 8 Kieran Murphy.
Replacements: 16 Kirby Myhill, 17 Phil John, 18 Deacon Manu, 19 Craig Price, 20 Dan Thomas, 21 Liam Davies, 22 Daniel Evans, 23 Nick Reynolds.
15. Tom Homer; 14. Topsy Ojo , 13. Jonathan Joseph; 12. Steven Shingler; 11. Marland Yarde; 10. Daniel Bowden; 9. Darren Allinson; 1. Clarke Dermody (Captain) , 2. Brian Blaney; 3. Paulica Ion , 4. Nick Kennedy , 5. Bryn Evans , 6. Kieran Low; 7. David Sisi; 8. Richard Thorpe
Replacements: 16. Pete Austin; 17. Max Lahiff; 18. Faan Rautenbach , 19. Bob Casey , 20. Kieran Roche; 21. Guy Armitage; 22. Shontayne Hape , 23. Ross Samson