From Wikipedia, I was quite surprised:
A defence conference was held in Singapore in October 1940. Representatives from all three services attended, including Vice-Admiral Sir Geoffrey Layton (Commander in Chief, China Station); the General Officer Commanding Malaya Command, Lieutenant General Lionel Bond; and Air Officer Commanding the RAF in the Far East, Air Marshal John Tremayne Babington. Australia was represented by its three deputy service chiefs, Captain Joseph Burnett, Major General John Northcott and Air Commodore William Bostock. Over ten days, they discussed the situation in the Far East. They estimated that the air defence of Burma and Malaya would require a minimum of 582 aircraft.[88] By 7 December 1941, there were only 164 first-line aircraft on hand in Malaya and Singapore, and all the fighters were the obsolete Brewster F2A Buffalo.[89] The land forces situation was not much better. There were only 31 battalions of infantry of the 48 required, and instead of two tank regiments, there were no tanks at all. Moreover, many of the units on hand were poorly trained and equipped. Yet during 1941 Britain had sent 676 aircraft and 446 tanks to the Soviet Union.[90]
Quite an interesting read actually, I will need to dig out some of the resources for a more in-depth look when I have time.