Neath fly-half Lee Jarvis kicked 19 points in an inspired second-half performance by the Welsh All Blacks who maintained their impressive start and 100 per cent record in the Celtic League.

Jarvis was the architect but Neath had plenty of other heroes as they moved into strong contention for a quarter-final place.

The Scarlets had led 6-3 after a bruising first half but Neath came out after the interval, firing on all cylinders, to run out convincing winners.

Llanelli may have won the previous seven encounters between the sides, but Neath began the match with a visible determination to redress the balance.

The prolific Jarvis, Welsh rugby's leading points scorer last season, opened his side's account after 15 minutes before Llanelli responded with two successful Stephen Jones' strikes.

It had been a frantic opening half, littered with errors, and some aimless kicking with defence, for the most part, dominant.

Neath had enjoyed the better of possession and territory, but they were unable to make it pay as Llanelli hung onto a three point advantage at the break.

It was a lead that lasted barely three minutes after the restart.

Jarvis found his range once more to level matters, then Neath blasted ahead with two tries in the space of five minutes. Tongan centre Dave Tieueti did the initial damage, cutting through some frail midfield tackling from the Llanelli midfield, before feeding Bristol wing Sean Marsden for a try in the corner.

Jarvis converted and back came Neath once more as flanker Hywel Jenkins romped under the post for a try he will long remember against his former club, Jarvis converting again.

Llanelli's misery continued when British Lion number eight Scott Quinnell was shown a yellow card for persistent offending and the resultant Jarvis kick made it 23-6 to the home side.

Llanelli did manage some response when they were down to 14 men as international prop Iestyn Thomas drove over for his first try for his new club and Jones converted.

But that was as good as it got for last season's European semi-finalists.

Two more Jarvis penalties, one from well inside his own half, put Neath out of sight to also deny their Pool A rivals a bonus point.