2:55 P.M.， Sunday， October 12London， England A cold October rain slanted down on Knightsbridge where BromptonRoad intersected Sloan Street. The steady stream of honking cars， taxis，and red double-decker buses turned south and made their halting waytoward Sloan Square and Chelsea. Neither the rain nor the fact thatbusiness and government offices were closed for the weekend lessenedthe crush. The world economv was good， the shops were full， and NewLabor was rocking no one s boat. Now the tourists came to London atall times of the year， and the traffic this Sunday afternoon continuedto move at a snail s pace. Impatient， U.S. Army Lt. Col. J，stepped lightly from the slow-moving，before his destination. The rain was let-stvle No. 19 bus two streetsev~