The British thought that tanks cannot be use in the thick jungle of Malaya, therefore, they did not set up any anti-tank defence. However, it turns out that the Japanese had developed a tank small enough to move though the thick jungle. This type of tank, though weak compare to other bigger tank, proved enough to dealt with the British troops, who did not have the equipment to handle the siutation.
The British were unable to stop Japanese coastal landings, as their two battleships, the Repulse and the Prince of Wales was sunk on 10 December 1941 by Japanese fighters, due to lack of air cover.
Also, the British force had communication problems, as the orders issued were unclear, leading to confusion and disorganisation among the troops.