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AHC: British Mobile Forces Better Prepared In 1940

I'm interested in what the British could have done differently to better prepare their mobile forces in the lead up to WW2.

Here's one possible POD I found, Archibald Montgomery-Massingberd created the "Mobile Division" but seems to have held back innovation. What if instead he fully embraced mechanized warfare?

He was appointed Chief of the Imperial General Staff in February 1933.[12] Among his main achievements at this time was the mechanising of the Cavalry:[23] indeed he was the driving force behind the formation of a permanent "Mobile Division".[24] Despite this, according to Williamson and Millett, he was a great obstacle to innovation of mechanized forces and suppressed the analysis of the British army's performance in World War I initiated by his predecessor, Lord Milne.
https://en.wikipedia.org/wiki/Archibald_Montgomery-Massingberd

The division was formed in November 1937 on the initiative of General Sir Archibald Montgomery-Massingberd, the Chief of the Imperial General Staff (CIGS). At the time, it was named The Mobile Division. The choice of the division's General Officer Commanding reflected the tensions within the army. The Secretary of State for War (Leslie Hore-Belisha) wanted a Royal Tank Corps officer to command, as tanks would be the main force of the division, but Montgomery-Massingberd wanted a cavalry officer. Supporters of Montgomery-Massingberd proposed that the tank element of the division should be formed from cavalry regiments equipped with light tanks only, and that the tank brigade and its heavier tanks be removed from the division. The compromise was the appointment of Major-General Alan Brooke, who was from the Royal Artillery.[3] When Brooke was promoted, his replacement was a cavalry officer.

As formed, the Mobile Division was made up of the 1st and 2nd Light Armoured Brigades, the 1st Army Tank Brigade, artillery, engineers and signals. Its paper strength was 620 armoured fighting vehicles, but 7⁄8 of these were reconnaissance vehicles, and of those some were being simulated by trucks. The heavier tanks were in the tank brigade, and until cruiser tanks started deliveries in December 1938 they were obsolete Medium Tanks. At the same time, the organization of the division was changed to a Light Armoured Brigade (three regiments with light and cruiser tanks), a Heavy Armoured Brigade (three regiments of cruiser tanks) and a Support Group (motorized rifle battalion, motorized artillery regiment and a company of engineers). In practice, with insufficient cruiser tanks to equip the division, there was no difference in numbers and type of tanks between the light and heavy brigade
https://en.wikipedia.org/wiki/1st_(United_Kingdom)_Division
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