As well as the partnership with Virgin, Brawn GP also attracted sponsorship on a race-by-race basis, breaking away from the tradition of season-long deals.
Their car ran for the first time only in March but quickly emerged as the fastest in F1.
"We were absolutely delighted to get involved with them when they didn't have any money before the Melbourne race," added Branson.
"It enabled them to prove that they had a great car and great drivers and they've obviously gone on to fantastic things.
"It was the perfect relationship. Virgin loves to support an underdog but they are now one of the most expensive teams out there and certainly not underdogs any more.
"But we will make an announcement in the next month but at the moment we just want to celebrate a magnificent season with the Brawn team, Jenson and Rubens Barrichello, who did fantastically also."
Branson admitted to being totally surprised at Brawn's success this season, and recalled how he flew to Australia to put Virgin stickers on the car before the opening race of the 2009 campaign.
"I don't think in our wildest dreams we thought this would happen. I knew they had a good car, as I happened to know one of the test drivers," explained Branson.
"But when I got on a plane to Melbourne with some Virgin stickers in my bag, having just shaken hands and given them some money, the last thing I expected was a first and second in the championship race."
I think one thing people have overlooked is the fact that Honda wrote out a cheque for £120m so the team didn't go bust
Sir Richard Branson
Branson also felt that Honda should take some of the credit for Brawn's success, despite their decision to pull out of F1 at the start of the season.
"I think one thing people have overlooked is the fact that Honda wrote out a cheque for £120m so the team didn't go bust," stated Branson.
"There are many people who would have just pulled out and saved that money and they have got no credit for that.
"If you turn the clock back 12 months then it was a horror story for the car industry and really good car makers like Honda and they had to make a tough decision.
"But they developed the car and they deserve some credit but I doubt they'll get a lot despite behaving in a very gentlemanly way."
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