Fielding drills pay dividends for England
England have been all over South Africa since the first ball of this match, and outplayed them in every aspect of the game.
On Saturday, England's bowlers chipped away, backed up by some outstanding catches while South Africa's batsmen - with the notable exception of Ashwell Prince - looked tentative and lost.
England have been working exceptionally hard at their fielding - and their catches in particular.
The new fielding coach, Richard Halsall, has introduced a raft of new routines to complement a range of new specially-designed equipment, and there is no question that England's ground fielding and catching has improved...
One effective exercise Halsall has brought in is hardly rocket science - but has made a difference.
He uses a bowling machine, set at ground height, to pump out catches which, because of the angle, more closely resemble the trajectory the ball takes when hit by a batsman.
Up to now, the accepted method has simply been to thump catches up into the sky and wait for them to come down to earth again.
Andrew Strauss took the first of three top of the range catches today, flinging himself low and wide to his right at first slip to remove the dangerous Jacques Kallis off Ryan Sidebottom for seven.
The other two were both caught by the superbly athletic James Anderson at mid on. Anderson is a brilliant mover, but given the fact that he is also a fast bowler makes his mobility all the more remarkable.
Prince showed precisely the grit and determination that South African cricketers are renowned for.
On a very good pitch, he simply dug in and showed much more resolve than his colleagues who will be dismayed by their performance.
As we thought, Monty Panesar made them all feel uncomfortable with the pressure of men around the bat, and some spin from the rough.
I am more convinced than ever that Panesar will have a leading role to play in this series even when, inevitably surely, the real South Africa stands up.