I've read Slim's book "Defeat into Victory" and hold him in high regard. He was a modest and capable general, well liked by the troops, both Indian and British (I read a British soldier's account from the trenches). But if your view of British officers is of holding their chin up, unflinching against hostile fire, then I think you've been reading only British accounts of that history. Even Slim's early chapters describe a chaotic and panicked retreat from Burma and Singapore. But you have to read other accounts, especially Indian accounts of the same events to understand that in retreat the British empire and its army often were far too concerned with their own safety at the expense of the civilian refugees, even blocking fleeing, starving civilians from exit roads so that they and their families could flee first. They saw the British take food from precarious and starving villages and use it as a stockpile to ensure their own food safety in Europe and elsewhere. Far more Indians than British died as a result of WW2 and many of those deaths were due to the British efforts to save themselves at the expense of their subjects. No doubt there was bravery too, on the part of the British (and Indians, Americans and troops from a number of other nationalities) in the battles of Imphal and Kohima and in the subsequent recapture of Burma and Singapore. But British behavior during that initial thumping at the hands of the Japanese in Burma guaranteed that their already precarious empire in India was all but finished.