Carter added two penalties and Andrew Hore scored a try before Jones gave Wales hope with a 75th-minute penalty.
But with 20 minutes to go, Llanelli's backs finally showed their superiority to create a second try for Jones.
The try and Jones' subsequent conversion - after he had gathered his senses, addled briefly by a clattering behind the line - gave Wales a handy 10-0 lead early in the game.
The Tigers trailed 10-6 at the break to a Morgan Stoddart try and Stephen Jones' boot.
Worcester took the lead through a Sam Tuitupou try and Matthew Jones added a penalty to make it 8-0.
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That made the scores level but Rovers edged ahead again courtesy of a Dobson penalty before a Stuart Jones try put Castleford back in front.
Stephen Jones kicked Scarlets into a 16-14 half-time lead before Gordon Ross answered but Kees Meeuws' try and a Jones penalty saw the Welsh side home.
Mr Jones will try to overturn the 1, 115 majority of Labour MP Gareth Thomas.
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The Wales centre off-loaded to Priestland who cantered to the try line, Stephen Jones failing to convert.
Stephen Jones' try just after the break made him Scarlets' highest-ever points scorer and restored the lead.
And then came Argentina, whose naivety played into the opportunistic hands of try-scorers Stephen Jones and Shane Williams.
Mark Jones' try gave the Welsh side hope as they trailed 9-8 at half-time but they were blown away after the break as the French picked up the pace.
While Wales' first try owed much to Jones' quick-thinking and the Pumas dozing off in defence, the second was born 14 years ago in the old Cardiff Arms Park.
Jason Tovey kicked three penalties in the first half and another in the second while Steve Jones scored a try.
With the extra man the Scarlets scored an injury-time try, Davies collecting a Jones chip and putting King over by the posts.
Leading the Bedouin's beloved beast of burden seems to be the most popular photo opportunity, but try to resist playing Indiana Jones with the safari-suited archaeologists.
Tom Shanklin also crowned his 50th cap with a try while the recalled Stephen Jones enjoyed a 100% kicking record, scoring 20 points with his faultless right foot.
However, when the Quins capped a five-minute spell inside the hosts' 22 with Jones's try, it was down to some desperate defending to keep the visitors from extending their lead.
Two Stephen Jones penalties were sandwiched by a finely worked try from the home side's first real attack - Jones putting Samoan lock Jonny Fa'amatuainu through a gap before King sent fellow centre Davies over.
Rob Parker, Arundel, with his second try, and loose forward Stuart Jones led their spirited second-half recovery.
The Dragons made a terrific start to the second half, putting captain Jones over for a try within two minutes.
An early try from David Lyons and Stephen Jones' boot helped the home side to an early 13-0 lead in Llanelli.
Stephen Jones put in a try-saving tackle on his rival fly-half but the ball rebounded off the Scarlets man into touch and the Ospreys had a five-metre attacking line-out.
Matthew Jones' boot and a try from wing Adam Hughes gave Dragons an early lead.
However, the Scarlets had the consolation of Sean Lamont's late try from a perfectly-weighted Stephen Jones cross-kick.
Fly-half Stephen Jones also scored an opportunist try to finish with 17 points -- 13 of them in the first half as the Welsh led 13-3 at the break.
But Jones was then mauled over the try line and a late Evans kick sealed it.
Fly-half Jones converted the 19th-minute try from the touchline and then set up another attacking platform that threatened Leicester's line.
Ryan Hall had a try disallowed for a forward pass and Jamie Jones-Buchanan also went close for Leeds as Rovers clung on.
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