British and Irish Lions roar past Waratahs 47-17 at Allianz Stadium The British and Irish Lions remain unbeaten on their Australian tour. Smashing the understrength Waratahs 47-17 in Sydney. IN 2001, the Lions and the Waratahs were busy having a brawl when a game of rugby broke out. Twelve years on, however, the cool-headed discipline shown to sidestep a repeat of that infamous clash was the key to the Lions scoring an emphatic victory over NSW last night. That was the view of Lions coach Warren Gatland after his side continued their undefeated tour by powering away from a gusty - but outclassed - Waratahs side in the second half at Allianz Stadium. GALLERY: Waratahs v British and Irish Lions in pictures The Lions scored three of their five tries in the last 40 minutes to post a 30-point win over NSW, who were depleted of their Wallabies but still left the tourists sporting lumps and bruises after a hugely physical showing. Heading into the week of the first Test, some Lions are of more concern than others; the biggest worry being centre Jamie Roberts, who is suspected to have torn a hamstring and may have played his last game. British and Irish Lions Warren Gatland says he is very pleased with his side's big win over the Waratahs. The Waratahs fought hard all match and scored two tries through veteran centre Tom Carter, but the incredible points machine that is fullback Leigh Halfpenny was a decisive factor. The Lions star scored two tries and kicked 20 points with a flawless night with the boot. But while the Lions may have been black and blue post-match, the fact they didn't see red during the occasionally feisty clash was praised by Gatland. Waratahs coach Michael Cheika admitted his side had gone out to target Lions halves Mike Phillips and Jonny Sexton, and giant lock Will Skelton at one point nearly buried Sexton underground with one hit. But the Lions complained the shot was late, and many others on the two playmakers were also late and off-the-ball. Lions captain Sam Warburton and assorted Lions water-carriers kept up a running list of grievances with referee Jaco Peyper about the foul play they were copping. Unlike in 2001, however, the Lions were proud of the fact they didn't dispense their own justice. Leigh Halfpenny celebrates after scoring a try for the British and Irish Lions against the Waratahs at Allianz Stadium. Picture: Greg Wood "I spoke at halftime the big key to this game was keeping our discipline," Gatland said. It would have been easy enough for someone to be taken late or lose their head and throw a punch, and then that be picked up and cited. From that point I thought our discipline was absolutely excellent. There were a lot of shoulders and charges and guys were taken late and stuff. That's rugby. People try and unsettle us a little bit, and it's how you respond to that. I thought our blokes were fantastic and they should be a credit to the Lions and the red jersey, because there was some provocation out there. They were outstanding. Cheika laughed that Sexton, his former player at Leinster, shot him a "dirty look" after the game due to the Skelton hit, but indicated the Wallabies needed to follow through with his strategy of harassing the Lions' playmakers. He's a big unit the guy who gave him a good old hit there, Will. It wasn't on my instructions at all," Cheika said. Tom Carter dives over to score the Waratahs' opening try against the British and Irish Lions. You have to put heat on the nine and ten at this level because they're orchestrating for this team, the way they're going to go, the direction, when they're going to go and all those things. You have to try and cut down their time. For all their spirit and effort, however, it didn't work for the Tahs in the end. The Waratahs attempted to play their up-tempo, side-to-side game but running into the teeth of a fast and most water-tight Lions defence, the gaps were hard to find. With Peyper adjudging them on the wrong side of most 50-50s, as well, the Tahs kicked more ball than normal and armed with possession, the Lions showed their teeth. Showing strength in the middle, they found space wide with skill and precision and will make for a formidable opponent for the Wallabies in Brisbane next weekend. The game stayed close in the opening half when an early try to Jonny Sexton was matched by Carter's first, but Halfpenny's steady penalty collection and his try on halftime edged the visitors to a 23-10 halftime lead. A second to Halfpenny early in the second was again matched by Carter, courtesy of an offload by Skelton in a brilliant match that highlighted his huge future. But the gulf in class between the team showed late, and tries to Tom Croft and Davies sealed the match. Lions lock Paul O'Connell charges upfield against the Waratahs. The scoreboard suggested it was a one-sided night, but it was misleading. I wouldn't be happy with the scoreline. We are the least penalised team in Super Rugby so to have all those points against us from penalties was hard to take," Cheika said. It was a good physical battle. Where we got caught out was when we did turn over, the class showed they were able to finish the opportunities they had. Gatland said: "The Waratahs in fairness to them spoke about taking the game to us physically," Gatland said. They tried to do that and our guys responded to that physicality, but in the end we were too big and too powerful for them LIONS 47 (Leigh Halfpenny 2, Tom Croft, Jonathan Davies, Jonathan Sexton tries Halfpenny 4, Owen Farrell cons Halfpenny 4 pens) bt NSW WARATAHS 17 (Tom Carter 2 tries Brendan McKibbin 2 cons pen) at Allianz Stadium. Referee: Jaco Peyper. Crowd: 40,805.