It seems to me that it isn't so much the accuracy of the bombsight used on the raid that is significant, but the German fighters based at Bardufuss in order to intercept raids on the Tirpitz. "But they didn't Holmes". "Precisely, Watson, precisely!".
Lt Carl Heinrich Vesna (Sp?) was i/c the inland facing Wasserman Radar positioned to detect a follow up raid using the same technique of coasting in further south, entering neutral Swedish airspace, then attacking Tirpitz from the East. The programme suggests that it was not until Tirpitz itself detected the raid and alerted Bardufoss, an hour after the initial radar contact, that fighters were scrambled. Even then they were held for an inbound Ju52! By the time they got to Tromso the Tirpitz was sunk and the Lancs just gone.
Patrick Bishop suggests that Vesna was part of the German Resistance and deliberately sabotaged the Tirpitz's defence, hence saving the stripped out Lancasters of IX and 617 Squadrons, and instead enabled the destruction of the Tirpitz and 1000 members of its crew. How do we feel about that? What does the present German population think about that? Sobering thoughts indeed!
BTW, repeated tonight (Monday) at 1900 Hrs.