In addition, the British rank and file were also not very committed to defending Singapore as they were from Britain and would not give it their all. Thus, when the British were having their final conference, most of the commanders were against the idea of counter-attacking the Japanese leading to a easy surrender by the British.
The air defence which included fighter planes were inferior and outdated compared to the Japanese "zero" fighters which were more accurate and faster. Even the two British battleships, "Prince of Wales" and "Repulse", protecting Malaya and Singapore which were thought to be an invincible fortress but were actually old and not battle-ready were eventually sunk by the Japanese torpedoes, cleaning the way for the final Japanese victory.
However, these were not the only reasons as to why the British were defeated. The strategies that the Japanese used were even more effective. For example, the British predicted that the japanese would have to invade singapore through the south as the north is covered by malaysia's jungles which were thought to be inaccessible to Japanese tanks. However, the Japanese proved them wrong as they were well-trained in jungle warfare. Using bicycles and tanks, they moved swiftly through Malaya, towards