For wheel refurbs I would recommend a chap by the name of Dips in West London near Heathrow. He does all my wheels and is very well known in the BMW world. In fact, I will be picking up some recently refurbed and powder coated Classix wheels tomorrow morning from him. Will put some pics up on my build thread tomorrow afternoon if I get a chance.
For dents, I use a local guy to my by the name of Chris. He's very well known around my area of Camberley and surrounds and does a fantastic job taking out dents. I highly recommend him.