Australian 6th and 7th divisions sent to Singapore?

[HJ Tulp]

Well Singapore was down by the middle of February, so they had nowhere to base from. ITTL that's not an issue.

For your information :

British Submarine Operations in the Pacific

By Arnold Blumberg After the Royal Navy’s traumatic departure from the Pacific Ocean in early 1942, the 4th Submarine Flotilla and its depot ship, the HMS Adamant, operated with the Eastern Fleet based at Trincomalee––a large, natural harbor located on the coast of Sri Lanka in the heart of the...

warfarehistorynetwork.com

Again, which submarines? The link provided by @Admiral Bloonbeard admits that significant RN submarine reinforcements were only send after the Italian armistice in 1943. Before that the wiki about the Eastern Fleet only mentions HMS Truance as the sole British submarine.

 

[Peg Leg Pom]

There were none in the Far East/Indian Ocean until after Singapore fell. Again like the A.I.F. if they're to do any good they have to be there months before the Japanese attack.

 

[Cryhavoc101]

The Australians would most likely have taken their mixed bag of captured Italian, French and surplus British tanks with them to Malaya. A bit of a supply nightmare but they'd have murdered any of the Japanese tin cans pretending to be tanks.

Hell giving them a few Hundred Covenanters 'for training' would have served!

 

[Cryhavoc101]

Again, which submarines? The link provided by @Admiral Bloonbeard admits that significant RN submarine reinforcements were only send after the Italian armistice in 1943. Before that the wiki about the Eastern Fleet only mentions HMS Truance as the sole British submarine.

The Dutch did it....

Seriously though any POD/s that allow such a reinforcement of the far east would have to involve either a far better result in late 1940/early to mid 41 Or no Italian involvement) which would also mean fewer losses to the RN (no Crete losses etc) and therefore a greater ability to send ships and more aircraft

 

[BlackDragon98]

A possible POD is where the British have a sudden realization in the summer or spring of 1941 that the secret info aboard SS Automedon might not have been destroyed properly after it was lost.
Reinforcement are rushed to Singapore in a mad scramble as they realize the Japan might already be fully aware of how badly defended Singapore is.