Well, I've finally bitten the bullet and bought a Signum (black 3.0 V6 CDTi).
Its now sat on the drive way looking very sporty with its irmisicher grill and 18" alloys.
Not sure if I'll live to regret it though. I spent along time thinking about and it, having read lots of horror stories on the forum. I even test drove a 52 plate BMW 325 M sport estate but the Sigs interior seemed to be of a higher quality than the BM. Go figure!!
The clincher for me though was the previous keeper. I tracked her down from the V5 and she spent 45 minutes telling me how much she loved the car, and that it was the best car she had ever owned. Its obviously been cherished. She only sold it because she needed 6 seats.
So, its now mine. Hopefully it won't let me down.
Only time will tell.