"So I think he just wasn't ready for that sort of time, especially in a race where he had to work.
"Barry has been looking after him since and you couldn't ask for a better man for the job so I am sure he will be fitter."
McGrath said Orange offered to come north to drive Classie Brigade even though it would have meant passing up several winning chances at Addington. "But I told him to stay down there and keep getting winners for the premiership. I'm sure Nathan will do a great job."
The race may not come down to Purdon's skills as much as what unfolds in front of him.
If Billy Badger can step well from his 15m handicap and work around to the lead, leaving Classic Brigade to do all his own work, then it becomes a huge challenge.
But if natural front runners like Juice Brogden or Seaswift Joy get the lead and their drivers are keen to stay there then Classie Brigade could get the perfect drag on Billy Badger's back and be the horse to beat.
Billy Badger's trainer Robert Dunn holds a key hand in tonight's main trot too with Woodstone and Sundees Son both in winning form and with the speed to threaten open class rival One Over Da Moon.
The latter has been favourite for similar races recently but not well suited by handicaps.
And while the best version of him would win back to the 1700m mobile tonight, Woodstone in particular looks to be racing at least as well if not better.
Trot tips
• Best bet: Naholo (R7, No.2). Has been racing in far stronger southern fields and should win fresh up for Steven Reid.
• This time: Like A Wildfire (R4, No.4). Finally gets a good draw and should try for all the way win.
• Newcomer: M'Lord Mackendon (R9, No.6). Southern race winner up against mainly maidens and from country's leading trotting stable.