At the congress of Vienna Britain refuses to agree to withdraw from any colonial territories it occupied during the Napoleonic wars.
It has possession and just doesn't want to leave figuring they earned them with all with blood sweat tears and money spent in the wars.
Practically this means britain keeps the Dutch East Indies, the French Caribbean and French India.
I probably didn't have a complete list of all the overseas territories Britain occupied in 1814-1815.
Did they in fact occupy *all* French and Dutch (what about Danish?) overseas colonies, or were some just left isolated during the Napoleonic wars? *during* the wars, the British never assigned any territories seized from France to a Bourbon Administration, did they? [not to my knowledge]
What are long term consequences?
The Prussians and Austrians and Russians (& Dutch & French) probably feel the British were greedy, and make their own claims for compensatory expansion within Europe on their own behalf.
Perhaps a knock-on of assertive British unilateralism with regard to the overseas territories, is that there is no persuading Prussia to relax its aims against all of Saxony and Russians aims against Prussian Poland (wonder what the border would look like). I also wonder if the Netherlands (or Denmark) would or could get any territorial compensation on the mainland.
This PoD in itself does not necessarily forestall later French, Dutch, Danish or other European colonial enterprises starting from scratch in areas yet unclaimed by Europeans. Things could go a few different ways.
On the other hand, the French may read the British actions in 1814-1815 as meaning the British are likely to sooner or later squash or grab French overseas colonial attempts, so the French might themselves hesitate to start colonial enterprises in Algeria and elsewhere in the 19th century, at least for a generation or two.
With the Brits in continuous possession of the old DEI & having the center of Batavia, they may not bother to build up Singapore.
I wonder if the Dutch would try to start any new colonies from scratch anywhere in the world. In Africa, perhaps in areas of the Malayan straits as yet untouched by Britain. Or they may figure that colonialism is a game they cannot win. Interestingly, the Dutch outpost at Deshima, Japan is rather more isolated without having the DEI to link up to.
On British policy in the Far East, one wonders if it would boost British efforts in the region and the drive for the China trade, or make them more complacent, perhaps delaying the opium wars.
If the French and/or Dutch try founding new colonies from scratch, and Britain is mainly content with its Napoleonic War gains, you could have some interesting opportunities. Perhaps the French moving first and more aggressively in New Zealand, earlier French interest in Indochina and Korea, more aggressive French led efforts to open the China market.
The Dutch probably wouldn't do it, but it they want to restart a colonial enterprise in the east perhaps they could try to seize Taiwan where they had a dormant centuries old claim.