First off, there's been a few decades since Independence. Surely the reasonable peoples of Africa can re-draw the boundaries.
Who exploited the natural resources of England? English people! Did all benefit? No, the vast majority didn't. So why treat abroad any different? Press-gangs in the ports, conscription in the countryside. Poor houses and debtors prison, and deportation. In 1880 the life expectancy was 39 years. Life in the colonies was harsh, but white, English people were dropping like flies too.
Promoted strife? Doubt it. Strife is bad for business. Most colonies were initially taken to stop the threats to trade routes.
Taking everything? Like the Indian train lines? Or the buildings? Codes of law? Language? Democracy? Hmmmm... All the mineral wealth? No? What, exactly? To be cynical, most things weren't portable to take.
Indigenous I imagine includes the Maoris who were the only persons on New Zealand mainly thanks to them killing all the others. They were so warlike that they were the only indigenous peoples to have a treaty with the British. Obviously they learnt these skills plaiting flowers...
Here area few names that come to mind:
India
UAE
Malaysia
New Zealand
Ireland
Burmuda
Egypt?
Bahrain a colony in all but name
Kuwait [protectorate]
Cyprus - the invasion was hardly the British fault.
Hong Kong and Singapore are both areas of territory that either were or are self governing. Racially both were mixed and both have done extremelly well.
Most of the Caribbean were exploited, downtrodden farms and most are doing OK.

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