Re: "The first ever jet combat was a Gloucester Meteor against one of these 262's"
From http://www.wpafb.af.mil/museum/history/korea50/k50-2.htm
After defeating the NKAF, UN air forces enjoyed a period of air supremacy until the arrival of the MiG-15 in November 1950. Initially flown in combat by Soviet pilots, and later by Chinese and North Koreans, the MiG-15 potentially threatened to wrest control of the air away from UN forces, as it seriously outclassed the best USAF fighter in Korea, the F-80C. Even so, F-80 pilots were able to turn inside the MiGs when attacked and scored some victories.
In fact, on November 8, 1950, in the first jet-to-jet combat in history, Lt. Russell Brown scored the first victory against a MiG-15.
Thought so. Didn't think there was any jet to jet combat in WWII.