So, Britain would reap more economic benefits from running its colonies and thus help with its postwar recovery.
What benefits would that be? India is gone regardless and what's left isn't all that valuable for what it would take to hold onto them. Most of these colonies weren't profitable and keeping them would just become an ever increasing drain on British resources, especially once you factor in how they'd have to worry about defending their Asian territories from a still alive imperial Japan. The Arab world isn't going to keep quiet under the British thumb either, not with Germany and Italy certain to support subversive elements to gain better access to its oil. Britain holding onto its remaining empire here would stretch it incredibly thin, and is likely to leave it worse off.