Definatly one of my favorite lil alternative histories, ie a massemmigration of britsh to india and the colonies bringing with them not just the institutions but also the industry.
In other words, centering the british empire in india and releasing the british isles, much depopulated, as dominions. Canada would similarily become independent early. Instead no such luck for australia or new zealand.
The empire would turn the indian ocean into a inner sea and connect singapore with capetown by unbroken rail.
Definately a major re-focus, and would ensure the indians might feel its their empire much as they did with earlier rulers bringing new customs, religions and technologies.. aryans, afghans, mughals etc.
Similarily the economic benefits would be immense by eliminating the vast transportation distances between rawmaterials, industry and customers. (think achieving 10-15% annual growth rates for a century or two! ..china taking the world today with mere 8% for 20+ years)
In the end monarchy would be the new norm, not republic.. and "freedom" is guarded not by america but the imperial indian legions. A some 20 million strong military force at home in asia, the med and africa alike. History would definately be rewritten