If a week is a long time in politics, then a year in cricket must seem like a lifetime for Eoin Morgan's team who are currently unrecognisable from the side bundled out of the World Cup virtually before the National Anthems had finished.
Encouragingly, their nerve held in game two where they could have folded chasing a competitive target on a tricky track which demanded dexterity over destruction.
Man of the moment Jos Buttler, understandably snapped up to play in the IPL in the recent auction, again grabbed the late headlines by transforming a tricky situation into a serene victory, but it was the maturity of Alex Hales at the top of the order which gave Buttler the platform to play his match-securing cameo.
In truth, not all facets of England's game are yet working effectively, but that is arguably why they are beginning to look such an impressive unit given they are winning convincingly.
There looks better to come from the likes of Jason Roy, Morgan and even Joe Root who scratched around for his 38. The Yorkshireman failed to find his normal fluency, but still displayed quality game management to support Hales in an important partnership, one that doused South Africa's hopes of levelling the series.
With David Willey batting at 10, England boast one of the deepest battling line ups in World cricket and it is hard to envisage South Africa will ever post enough runs to trouble them unless AB de Villiers can produce one of his trademark innings.
There were signs at Port Elizabeth that he was rediscovering his confidence and touch after an unlikely three-duck run in the Tests and the hosts will hope the return to Centurion where they inflicted a heavy Fourth Test defeat will impact on their rivals.
However, this is an England side playing with increased confidence and exuberance at present and, with the series still up for grabs, they are fancied to press home their advantage.
The only change may come in the pace attack with a return to the rarified air of the Highveld, the seamers may have more of a say and it would be no surprise to see Stuart Broad recalled.
Either Chris Jordan or Willey could make way, although the former's fielding in this series has again stamped him as one of the best in that sphere.
Broad's presence would strengthen England still further and they are taken to wrap up another win.