Fair enough Ray but it probably needs to work the other way. You take the car back, explain your concerns, allow them to check it and offer their view.
If it comes back and they say 292bhp they can explain themselves and you get another tuner to assess it and agree/refute that, then you decide on your actions. This was done originally in 2006? It's possible something has changed, if so what and why?
If they say 245bhp you ask why, what's happened? look at the causes and any blame if indeed there is any.
I think that you know they couldn't just phone up and explain a difference like that, they'd need to see/test the car and then could comment.
I just find it a bit unfair to make an assumption immediately that you must have been "had over" so to speak which is my interpretation of what you've said, either by Scott or Owens or a conspiracy of the two....
Mine doesn't run yet, but hopefully soon. I will take it to a couple of other dynos afterwards, My local one that has done the car several times and is a good reference, possibly to Ben out of interest, that would be useful for both of us.
As you say though I'm sure you'll get to the botttom of it, everyone will be interested in what's learnt.
All the best and I hope it's sooner rather than later.
p.s. prices for ceramic coating would be of interest to me.