Dan Biggar believes there is more to come from this Wales team, but would regard a Grand Slam as the first part of a fitting two-part leaving gift for Warren Gatland.

The Wales replacement – who steered his team to victory with a masterful 20-minute cameo against England on Saturday – believes the peaking of his team’s powers should come in the autumn at the World Cup in Japan, rather than in their next two games.

Wales have already gone on a record-breaking run of 12 successive victories, but the Northampton No.10, who came on for Gareth Anscombe in Saturday’s 21-13 victory, says they can still improve.

“We’re in a good spot, but we are fully aware the World Cup is coming up at the end of this year, so we are conscious of not peaking too soon,” said Biggar.

“We’re winning at the moment and it feels great. But I’ve also played in teams where losing became a habit so we have to keep delivering and working hard.

“Every victory we have at the minute is just another step to grow the team to the World Cup.”

Next up for Wales is a trip to Scotland, whom coach Warren Gatland has never lost against, followed by Ireland back in Cardiff on a potentially tumultuous final weekend.

“We’re in a great position,” said Biggar. “But we’re fully aware that one slip-up would probably mean we don’t win the Championship.

“It would be the perfect way to finish off what has been a great reign by Warren but we know the next two games will present very difficult challenges.”

“Let’s see if we can get it to 14 first, and go from there,” he said referring to the Grand Slam, when asked if he would celebrate the record.

Biggar’s pinpoint cross-kick for Josh Adams’ brilliantly-taken try was the highlight of his match-turning contribution, but there was also a nerveless touchline conversion beforehand after Cory Hill had gone over.

The former Osprey also hit some booming clearing kicks, battled to win high balls after a chase, and made inroads with ball in hand in a display that again showed his extraordinary ability to dictate the pace and rhythm of a match he had only just joined.

The result was a turning of the tables in recent matches against England when it was Elliot Daly or Sam Underhill who made the decisive late contributions.

“Both those games ended in us losing and there was a real resolve among the boys not to let this one slip,” added Biggar.

“We were aware England could strike from anywhere with the players we had and we knew if we didn’t win then more than likely they would go on to win the Grand Slam.

“You could see the hunger with the boys in the last 30 minutes, some of whom had never beaten England. Physically we were excellent against a huge English pack. That got us over the line.”

Wales are two wins away from marking head coach Gatland’s final Six Nations campaign at the helm with a title and Grand Slam glory.

Scotland at Murrayfield and Ireland in Cardiff are the remaining hurdles to overcome in pursuit of a third Six Nations clean sweep since Gatland took charge

“The biggest challenge for us now is to not be happy with beating England and accepting where we are at the moment, but try and build further and create something very special,” Gatland said.

“It would be pretty special if we could win the championship in my final year with Wales, and sign off like that.

“I was really proud of the performance. The second half was as good as it gets, and a lot of people out there might sit up and take a little bit of notice of that.

“Eddie (England head coach Jones) said they were coming down to spoil our party. Well, maybe we’ve spoilt theirs.

“The great thing about the Six Nations is that anyone is potentially capable of beating anyone else on their day.

“That’s what we want. We don’t want England – or France, like they did in the past – dominating this tournament. We want unpredictability, teams being tactically astute, and upsets.”