The G4 thing has been discussed here before. It remains to be seen how bad it proves. I still think it is all to do with bad frequency planning to get such a clash anyway, regardless as to whether they get away with it. Here's hoping that in practice it is not an issue.
Going a bit off topic here, but when the rolled out digital in our area, our local Tesco hit the news because it was creating some weird electrical blip in the petrol station canopy and lots of keys wouldn't work.
4x4s seemed to be particularly affected and I had to help to push loads of them off. I had to get pushed myself once or twice (I was working for a car sales company).
As soon as you got out from under the canopy, everything worked again.