http://www.thetimes.co.uk/tto/news/uk/d ... 045177.ece
The article is pay walled, so here are the basics:
It is claimed that a German at one of the coastal radar stations was working for the enemy, so he mis-directed Luftwaffe fighters so they would not intercept the British bombers and also delayed sending warnings on to the battleship. Investigation into these claims found a July 1945 document that indicated that he was indeed associated with the Norwegian Resistance.
Also during the air raids against the battleship while at Kaa Fjord, warnings from the coastal radars were so delayed that in some cases the radars on the battleship detected the aircraft before the warnings were received aboard the battleship, raising the question if a similar thing occurred then-assuming the claims are correct.