So we agree on the fact that they took very much.
No, we don't. Firstly, because that's not what you said:
Britain took every foreign colony It could snatch from other countries.
And secondly, because it isn't true. I would class "very much" as half your opponent's pre-war territories (Treaty of Tilsit), your opponent's holdings in Italy, the Balkans and southern and central Germany (Peace of Pressburg) or 400,000 of your opponent's subjects (Treaty of Schoenbrunn). At Vienna Prussia takes very much; Britain takes very little.
Let's remember the complaint that you were trying to set right:
This is just caricatural propagande
There was peace several Times with Austria. Austria broke it alone.
There was peace with Prussia. Idem in 1806.
There was peace with Russia. Idem in 1804.
"I find it inexplicable that good historians can simply assert what is technically true, that Prussia started the war of 1806 or Austria that of 1809, and not ask themselves what could have induced so timorous a king as Frederick William III, eager only to enjoy further peace and neutrality, to gamble everything on war against the French? Or what could make so narrow-minded and fearful a sovereign as Emperor Francis, whose highest ambition was to hang onto his hereditary estates in peace and who had been so thoroughly beaten by France in three great wars throw the iron dice again alone and unsupported in 1809?"
"Between 1800 and 1812 almost every government in Europe, and most statesmen in Europe, went much further in trying to appease Napoleon than Chamberlain did with Hitler... The experience of Napoleon's power was enough to make every European power try some form or other of accommodation- joining him if possible to get a share of the imperial spoils, buying him off, or making an arrangement to stay out of his way. Some states like Bavaria did this fairly eagerly and trustingly, others like Austria only with reservations or in desperation. Only Britain, which Napoleon could not destroy, continued to fight doggedly, and this only because it concluded in 1803 that an actual peace with Napoleon was humiliating and intolerable and in 1806-7 that any peace was impossible.
What demands explanation is not Europe's repeated recourse to appeasement, but its consistent failure. The only satisfactory answer is the simple and obvious one: Napoleon could not be appeased. Each war was the outcome of the uniform experience of one European state after another that it was impossible to do business with Napoleon, that peace with him on his terms was more dangerous and humiliating than war. It is most striking of all that the appeasers themselves, the very men who had advocated accommodation and coexistence with France, regularly abandon their own policies, admitting, even though they still dread war and fear defeat, that accommodation will not restrain Napoleon. This was true of Austria's Count Coblenzl and Archduke Carl in 1805, of Emperor Francis and Carl again by 1809, of Prussia's Counts Lombard and Hauwitz, the Duke of Brunswick, and King Frederick William III by 1806, of Prussia's Baron vom Stein in 1807, of Prince Hardenberg in 1808-12, of Count Rumiantsev and Tsar Alexander by 1812, of Count Metternicht in 1813..."
(Paul W. Schroeder, "Napoleon's Foreign Policy: A Criminal Enterprise",
Journal of Military History vol. 54 no. 2 (Apr. 1990), pp.147-162.)
The quote is lengthy, but it neatly sums up the case. This is what the European states believed at the time: you may choose to dispute whether it was true in hindsight, but you can't handwave away the fact that, both at Chaumont and Vienna, they're determined to present a united front to put Napoleon down. That's the point that BlackFox5 was making.
Mauritius was not handed back.
My mistake, I retract it.
the British helped themselves to Ceylon, the Cape Colony, and Guyana anyway
Though the Dutch receive Belgium in return, which hardly means they lose out on the deal.
Malta and the Ionian Islands likewise ended up permanently under British control despite the fact that their pre-French governments had not been at war with Britain.
Probably something to do with the fact that the Maltese petitioned the British for annexation. The Ionian Islands were a protectorate, by definition not permanently under British control, and were in fact handed to Greece in 1862.
Otherwise they were inclined to keep what they'd taken during the war.
As the single most obdurate foe of Napoleon, which had spent almost twenty years propping up its allies with subsidies to fight France, you can't blame them for wanting at least some tangible reward for having done so. However, as the examples which you yourself cite show, they were prepared to hand back territories in the interest of retaining goodwill among its allies: by definition, not the act of a country which
took every foreign colony It could snatch from other countries.