In reply to peter.herd:
depends where you are in the UK, but we've done Newcastle to Amsterdam (overnight ferry setting off 1700 arriving 0900 the following day)then driven up through Germany into Denmark (we stopped over night there because of having young children but you could push on through).
We then took the "new" bridge over to Sweden, spent a few days at the nice Swedish bouldering area near an island on a lake camping site (can't remember the name but could easily look up our locations if it fitted with your plans).
From there an easy and scenic drive up to Oslo, wild camping on the way, before heading over to Bergen. Driving in Norway is beautiful but slower - so judge the distances accordingly - very easy to wild camp in amazing locations, we found.
We had three weeks and didn't feel pushed for time, but we didn't make it much more than Galdopiggan (spelling?) mountain range north.
Hope this helps - am sure you can do the same journey much faster if you don't have very young kids.
S