Note
Carried on driving and reached Halden at 1040 this morning, 12 and half hours driving in 15 hour total trip time (one refuel and 2 ferry crossings). Roads amazingly quiet until leaving ferry at Helsingborg then busy to Gothenburg, but sun came up there and the road was very, very quiet to the Norwegian border so just kept on driving.
Breathalysed at the Norwegian border - not worried, only had 1 beer in past 2 weeks!