The problem with Greece is that a weak intervention (as OTL) is likely to do more harm than good because it incites a German invasion without being able to handle it. Unless the British can send a dozen divisions to Greece (not likely), better to stick to sending supplies and air support.
The problem with Malaya is that there is no war in Malaya in 1941! Yes, the Japanese are making threatening noises, but if things go roughly as OTL, in 1941 the British will be fighting active wars not just in North Africa and Greece/Crete but also East Africa, Syria/Lebanon and Iraq. And they're still very short of both trained troops and equipment, and fighting at the end of horrible supply lines. So Malaya, as OTL, will be mostly left to second-string Indian battalions with poor equipment and a few token British forces with the officers they can most spare. Tanks? Sorry mate, we need them in Libya. Armoured cars? Sorry mate, we need them in Iraq. Aircraft? Any Spitfires we can prise away from Fighter Command will be going to Malta or Crete; Malaya gets the cast-offs deemed unfit to face the Luftwaffe.
Maybe if things go better in North Africa and the other operations have wrapped by the autumn there might be time to rush a veteran division or two to Malaya when the crisis hit. Hopefully with full equipment rather than just shipping infantry to the POW cages.
The problem with Malaya is that there is no war in Malaya in 1941! Yes, the Japanese are making threatening noises, but if things go roughly as OTL, in 1941 the British will be fighting active wars not just in North Africa and Greece/Crete but also East Africa, Syria/Lebanon and Iraq. And they're still very short of both trained troops and equipment, and fighting at the end of horrible supply lines. So Malaya, as OTL, will be mostly left to second-string Indian battalions with poor equipment and a few token British forces with the officers they can most spare. Tanks? Sorry mate, we need them in Libya. Armoured cars? Sorry mate, we need them in Iraq. Aircraft? Any Spitfires we can prise away from Fighter Command will be going to Malta or Crete; Malaya gets the cast-offs deemed unfit to face the Luftwaffe.
Maybe if things go better in North Africa and the other operations have wrapped by the autumn there might be time to rush a veteran division or two to Malaya when the crisis hit. Hopefully with full equipment rather than just shipping infantry to the POW cages.