Flintoff’s 146-ball 142 at Lord’s was his first domestic Test ton and brightened a fourth and eventually gloomy day for England, who had humbled their guests in the preceding limited overs competition.
"This will have given Freddie a huge confidence boost," said Vaughan, who made 33 and 28, but was powerless to prevent South Africa recording an innings and 92-run triumph "To do it against a team of South Africa’s ability and in front of a full house at headquarters will make his future a lot brighter."
Flintoff was also unlucky with the ball, but was ready to back himself to get a century until Vaughan told him it was against the rules. "He’s such a huge asset to the team when’s he in such confident mood," added his ISM colleague.
"I am sure Freddie will build on this performance and finally find the consistency we have been waiting to see from him at this level".
Vaughan believes Flintoff never really kicked on from his first Test hundred in New Zealand, but believes that now he is injury free, the time is right to show the rest of the world exactly what they can expect.
"Freddie’s shot selection was spot on, but there again his power is such that even when he blocks, the ball can go for four".
Vaughan was unsure whether the defeat would necessitate a few changes.
"The selectors meet on Thursday and between now and then we will try to develop a plan to beat them. I’m keen on having a team that I feel can beat South Africa and whether we look to the future I don’t know," he said.
"First we must work towards a better performance at Trent Bridge to put them under pressure," added Vaughan.