One particular place where stewards should be positioned is by the tunnel. There were two when the referee led the teams out.
However when Hereford manager Peter Beadle was sent to the stands it looks as though there was one steward by the tunnel.
Later when trouble erupted after Hereford's second goal two Didcot stewards came across the pitch, the steward in blue was from CB Protection, who cover games at Edgar Street.
After that when players were heading to the tunnel, it's difficult to see how many stewards were there. Four in this picture and two are these are the same two as in the previous picture.
The rules are quite interesting. These are from the FA ground grading notes and would apply to Didcot.