Berlin (Airport and the industrial suburb of Siemensstadt) was bombed before London was.
That is, if you don't count Zeppelin and Gotha raids on London and other British cities during the Great War. This is the futility of trying to establish who did what first.
As to Y-Verfähren RV Jones was a bit of a self promoter there, as research into the German records of KG100 show that the system was successfully used prior to when he claimed it was and used successfully thereafter. The British certainly were able to make its use difficult after they figured out how to jam it, but they didn't stop it from being successfully used against targets even as late as May 1941. Not sure about thereafter though, but the Baeddeker Blitz apparently was able to find its targets. By 1944 though the LW was having trouble finding London by night, so clearly the British managed to do something or at least the LW had lost its night skills.
A quote from Most Secret War, Jones' book. "The X-Gerat had been developed at least as early as 1937, and X-Beam stations had been set up for the bombing of Warsaw in 1939 and then transferred to the Eiffel region for operations against France..."
The difficulty wasn't that the British had trouble figuring out how to jam the equipment in 1940, it was getting those high up enough to gain an understanding of what was going on and to accept his theories. Jones was a rather clever chap attempting to figure out what the Germans were up to with the minimum of resources and personnel, not to mention a reluctance of senior staff to believe that the Germans were capable of producing such equipment. Lindemann (Lord Cherwell - scientific adviser to the PM) refused to acknowledge Jones' work, and claimed the Germans couldn't do what Jones was stating because their radio transmitters couldn't beam the signals around the curvature of the earth. It was after sending a naval officer flying round in an Anson detecting radio transmitted signals on particular frequencies during a German night bombing raid that Jones was able to confirm his theories that the Germans were using electronic means of guidance.
Jones was far from a blower of his own trumpet and if you read his book, Wiking, you'll find he gives credit to a great deal of individuals, but his effort in discovering this equipment for the British cannot be underestimated. Researchers who have investigated British records in the National Archive are quick to point out how accurate Jones' interpretation of events was. He also met with Plendl and his equivalents from Germany after the war and they were surprised at just how much he was able to have known as early as he did.
It's worth remembering that despite the issues with each of the German systems, they enabled the Luftwaffe to be the most accurate bombing force in the world; no one could achieve the results that the LW was carrying out in 1940 - 1941, not Bomber Command nor the USAAF or anyone else. Like Steve states, though, the LW personnel had other issues to contend with that affected their conduct outside the accuracy of their bombers. Jones himself states that he was surprised that the Germans didn't make as great a strategic use of this equipment and that had they done so, the results for Britain could have been catastrophic.
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