Report doesn't say anything that hasn't already been covered in this thread.
As far as cross-wind limit goes, I'd like to know where you're supposed to find that information? The only thing I could find on a google search was with regards to the BBMF aircraft actually, posted at Pprune and from which I quote:
"To safeguard against ground-loops on landing, a strict limit of 10 knots maximum cross-wind component is imposed for all Spitfires and 15 knots for the Lancaster."
So, on that basis, it would have made not a jot of difference if the BBMF had turned up in MK356 - it still wouldn't have flown, whereas the civilian Mk.IXs would have, and in BBMF hands no less...
Another source online states that the BBMF have a blanket limit of 10kts, which can increase to 15kts but only after a pilot has completed 50hrs on type - so again, it's a blanket limit imposed across ALL their Spitfires, and not different for each Mark.
Perhaps if they'd tweeted/spoken on the commentary at the show, to let people know why they'd cancelled while other Spitfires were still flying in the display and operating from the airfield, it might have avoided some of the confusion. Those around us at the show were disappointed, as I mentioned earlier in the thread - especially considering they'd brought in a BoB veteran that had been much-hyped in the commentary upon arrival, only to no-show with no explanation given to the public.