Radar developed much later

If the idea of Radar was not around in the first half of WW2 how much difernance would it have made?

How much worse would the Battle of Britain been for the UK?
 
This is so unlikely as to be pretty much ASB. Radar was being developed in multiple countries (even inside the British Empire), and also investigated by some private companies!
 
One of the key components for the WWII Radar Systems was the Cavity Magnetron valve... if its development in 1920's was somehow buttleflied away, the radar systems at WWII would be much more unreliable.
 
In addition, radar was just a part of the British system.

However, with a less good pre-warning system around, heavy fighters might do a little better instead of single engined fighters, compared to OTL. Maybe the British would have a roving heavy fighter with a decent range around in numbers, something like the Bf-110, Fokker G-I or Potez 630. The Westland Whirlwind is probably too range-limited to be able to do this adequately.
 
If the idea of Radar was not around in the first half of WW2 how much difernance would it have made?

How much worse would the Battle of Britain been for the UK?

Given some of the boneheaded decisions made by the British government pre WWII I supose Chain Home might not have been built. It would have had serious implications as the RAF would have had to maintain standing CAPs over Southern England and had much greater difficulty in intercepting raids. Would in the end it have changed the outcome? Probably not, the Germans at best could have driven the RAF further north and Operation Sealion was never much more than a wild fantasy on Hitler's part.
 
An earlier emergence of Lonnie Donegan, Tommy Steele, and Cliff Richard results in an increased demand for commercial radio, steering radio scientists and engineers away from military applications. Just another example of how pop music can kill you.
 
One of the key components for the WWII Radar Systems was the Cavity Magnetron valve... if its development in 1920's was somehow buttleflied away, the radar systems at WWII would be much more unreliable.

No it wasnt.
The cavity magnetron was only key to high-powered centimetric radar. All the longer wavelength radars used other (often commercial radio) components
 
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