More on that later.
It is estimated that around staff and patients were killed over two days. As the Japanese attacked through the Peninsula, their troops were ordered to take no prisoners as they would slow up the Japanese advance. They also overran cities and advanced toward Singapore.
So a distorted form of Bushido was revived as a way of reconciling traditional Japanese values of honour, humility and unassertiveness with a newly formed army that would be obedient in training, savage in battle and pitiless in victory.
Since the size of the Royal Navy was much reduced after the war, it was not large enough to commit powerful forces to the Far East on a permanent basis.
This had the not necessarily deliberate effect of increasing the amount of Japanese goods that could be purchased when the by-now-more-valuable foreign currencies were exchanged for the yen. But the effectiveness of the Japanese was shown when they captured the capital of Malaya, Kuala Lumpur, on January 11th Hong Kong was ruled out because it was too close to Japan and could not be properly defended; Australia, particularly Sydney, was ideal from several perspectives, but was simply too far from the interests that it was supposed to be protecting.
More than half never returned home. This changed in the interwar period, as countries became much more protectionist and some markets became more closed to Japan. Many Allied soldiers were simply too far away to influence the outcome of the battle. Our hairdresser was a spy.