There is a second report a while later. Unfortunately the conclusion is pretty much "we don't know", its still worth a read though.
Air Accidents Investigation Branch: S3/2006 Airbus A319-131, G-EUOB
There appear to be a fair few things that "can't happen" having happened in aircraft accidents, which is why I never believe anyone who says "oh don't worry, that can't happen"
Milt - I've never found the rudder to be backwards. If you see it as a "bar" like handlebars on a bike I can understand why it is thought to be backwards, but why would one want to roll right and use left rudder in a normally balanced turn? That seems very odd to me. It seems entirely natural to push right, go right. I would find it very odd to push right, go left. I do know others who think it is backwards and have the same opinion to you, so there is obviously no universal correct way round. Every time I have thought about it though, having it in a different sense seems mightily odd. Steering down the runway would be even more like chasing a fox!
There is a light aircraft around with reversed aileron controls. It has a control wheel and is from the 30's I believe - can't think of its name. I have a feeling the Shuttleworth collection had some input to its restoration, but otherwise my memory of it is hazy.