Scarlets fly half Rhys Priestland dives over for a try at Parc y Scarlets.
The Scarlets were the only Welsh region to record a victory in the second week's action in the LV= Cup.
Nigel Davies's young side romped home 32-17 at Parc y Scarlets to celebrate their first anniversary at their new home with a bonus point defeat of Worcester Warriors.
Fly half Rhys Priestland contributed 17 points, including a try, while wing Darren Daniel, No.8 David Lyons and full-back Dan Evans also crossed.
The Scarlets led 20-3 at the break and were always in control although a raft of changes disrupted the flow to allow the Warriors back in the game briefly. Worcester scored two late tries but Mike Ruddock's side never seriously threatened to win the game.
Replacement Ryan Lamb kicked a penalty five minutes from time to give London Irish their first win of their Anglo-Welsh campaign as they ground out a 12-11 victory against Cardiff.
Irish led 6-3 at the break thanks to a penalty apiece from Tom Homer and Peter Hewat, with Ceri Sweeney kicking a penalty for Cardiff Blues.
Hewat and Sweeney exchanged penalties after the interval before a Richie Rees try put the Blues 11-9 ahead, but Lamb stepped up to seal the win with Sweeney missing a tough long-range penalty in stoppage time.
South African Luke Watson announced his arrival with a debut try that swung the game, as Bath overcame Ospreys 21-11 in their clash at the Rec.
Watson drove over from a scrum for the opening try before Justin Tipuric replied for the Ospreys, but Daniel Browne made sure of the Bath win, with Ryan Davies converting to add to his three penalties.
Newport Gwent Dragons pushed Leicester Tigers all the way but came away empty handed from Welford Road. In an error-strewn game, Paul Turner's side lost 29-20 to a Tigers side which included eight internationals.
Jason Tovey to step inside the cover - reminiscent of Ieuan Evans' famous try for Wales in 1988 against Scotland - and go under the posts.
Jason Tovey and Aled Brew tries gave the Dragons an unlikely 12-11 lead at the break but Anthony Allen dotted down within two minutes of the re-start. A penalty try followed for the home side. Rhodri Gomer-Davies hit back for the Dragons to bring the visitors just three points behind but two Toby Flood penalties put the Tigers clear.
The LV= Cup Results
Cardiff Blues 11-12 London Irish
Newcastle 8-19 Harlequins
Wasps 21-14 Gloucester
Bath 21-11 Ospreys
Leicester 29-20 Newport-Gwent Dragons
Northampton 19-3 Saracens
Scarlets 32-17 Worcester
Wales U20 captain Tom Phillips and performance psychologist Dr Rich Neil explain why spending three days at Monmouth RFC has further strengthened the togetherness of the squad ahead of the #WorldRugbyU20s
Alongside Scarlets flanker James Davies and Cardiff Blues centre Cory Allen, three Wales Sevens core players have made the extended training squad for GB Sevens. Wales Head coach Gareth Williams tells WRU TV's Graeme Gillespie why Luke Treharne, Sam Cross and Luke Morgan earned selection in the initial training squad for Rio.
Wales Sevens head coach Gareth Williams tells WRU TV's Graeme Gillespie he has had to overcome a number of injuries before naming a competitive squad for this weekend's penultimate round of the World Series in Paris.
Merthyr were officially crowned champions of the SSE SWALEC Championship at Dowlais on Saturday where captain Andy Powell paid tribute to his side who have earned promotion to the Principality Premiership
Coleg y Cymoedd's season has had a spectacular ending with victory in two cup finals and a massive victory over one of the best rugby playing schools in the world - Welsh coach Warren Gatland's old alma mater, Hamilton Boys' High School.
WRU chief executive Martyn Phillips hosted the second meeting of the WRU Youth Board last weekend ahead of the Judgement Day IV regional double-header. Tthe board, made up of 15 under-21-year-olds from around Wales, heard presentations from head of participation Ryan Jones, policy and integrity manager Jeremy Rogers and national women's rugby manager Caroline Spanton, with Pro Rugby Wales CEO Mark Davies also on hand to hear the range of views aired.
Wales duo Rhun Williams and Liam Belcher, who makes a welcome return after five months of injury woe, look ahead to next month's World Rugby U20 Championship in Manchester where they will face Ireland, Georgia and New Zealand.