Don't disagree, but i suspect the spfl would copy what they do down south and interrogate everything. I could be wrong on that.
For me the var ref should get a time, say 15 seconds to make a call. If it is "clear and obvious" then you should be able to make that call in the given time. If you need to get the ruler out and start drawing lines and all this carry on, then its not a clear enough error to overturn.
I think we all know how these decisions would go in certain circumstances though...