Interim boss Lancaster restored pride to English rugby in the wake of a dismal World Cup showing beset by off-field problems and poor performances by leading the Red Rose to second in the RBS 6 Nations.
Under the guidance of the former Leeds boss, England won four of their five games and were only denied a potential Grand Slam after being pipped by Wales at Twickenham on the middle weekend of the championship.
Lancaster was also rewarded for putting faith in young talents such as Saracens fly-half Owen Farrell and Scarlets number eight Ben Morgan, who turned in outstanding performances.
Lancaster was interviewed for the post last week, along with former South Africa and Italy coach Nick Mallett, and there is a groundswell of opinion that the former should land the role.
Leicester outside-half Flood, 26, who played just one game in the Six Nations after recovering from a knee injury, agrees with those sentiments.
But also understands the RFU and new chief executive Ian Ritchie need to make sure they assess all potential options as they look to find the right man to lead the tournament hosts to the 2015 World Cup.
He told Press Association Sport: "It is difficult. Stuart did an excellent job in the Six Nations, he created an environment where all the boys were keen to work hard for each other.
"If you take into account what he has managed to do in such a short space of time then he has to get the job.
"He gave a lot of the younger guys a chance and he created a winning team that narrowly missed out on a Grand Slam in the game against Wales.
"But the RFU have to take all sorts of things into account such as experience and knowledge of players, things that we do not know about as players.
"But Stuart certainly did himself no harm at all with the way he did the job during the Six Nations. The way he handled it and went about it was a real credit to himself."
Flood's knee injury could hardly have come at a worse time as Lancaster took over from Martin Johnson and Jonny Wilkinson's retirement looked set to give the Leicester man the chance to make the number 10 shirt his own.
But the problem saw him miss the wins over Scotland and Italy, where Charlie Hodgson was handed the starting role.
Flood came on as a replacement in the thriller against Wales, but by the time he took the field Farrell had already lit up the Twickenham stage with a superb performance which belied his inexperience at Test level.
With Hodgson back from a finger injury, Flood was deemed surplus to requirements for the concluding fixtures against France and Ireland, but is determined to win his place back, starting with the summer tour to South Africa.
"The injury came at a bad time for me as it kept me out of the start of the Six Nations," he said. "I came back against Wales and I felt good, and we created a couple of good chances late on.
"But it was frustrating not to be involved in the final two games, but I understand that Charlie had been starting before I returned and once he was fit again I can't blame Stuart for wanting to bring him back into the matchday squad.
"I have a burning desire to win my place back. But to be involved in that trip to South Africa you have to be performing well for your club in the Aviva Premiership and I will be doing all I can to make sure Leicester finish the season strongly and get to an eighth-straight Premiership final."
Flood picked up a 26-point haul as the Tigers, who were 11th at one stage, moved up to third in the Aviva Premiership table with last weekend's 41-32 win at London Irish.
And Flood and his colleagues are targeting a home play-off place as they prepare to face Worcester at Welford Road on Friday night.
"We want to push for it," he said. "We know Saracens and Harlequins, the two sides above us, play each other this weekend and can take points off each other.
"But we have two tough away games to come against Quins and Northampton and they will be very difficult tests but as a club we have been involved in the last seven Premiership finals and we are desperate to make it eight."
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