Just picked up on this posting (sorry) and one thing is, I would always recommend a map and have always mapped diesel cars for years. (20+ years)
I think 232bhp is a bit optimistic, but should easily get a good 30 ish bhp so not far off
Always do your research (forums are best imo) and use a good tuner. The one I use is a fair old drive away but they have mapped a Leon, Superb and an A6 over the years and are very well established within the VAG forums
RR printouts can be a bit misleading and vary from one place to another, however mpg should be better (I reckon 2mpg on a 2 litre) and the car more 'driveable'. The power will be there and you will easily notice the difference, but a heavier right foot will give you worse mpg than it was before hand. Real world and it should be better marginally.
I know this post was a while back, but I hope you went through with it, if the tuner you was going to had a good history.