No doubt because they wanted to get back to fighting "real" wars.
I am not a military historian but after 1815 (Battle of Waterloo mainly) the British Army (which then did not include the Imperial Indian Army) did not fight a "real" war till the Crimean War 1853-56, which was in alliance with France, Turkey and part of Italy. Then there was a long gap till 1914. Post-1945 there has only been one year when the Britsih Army was not on active operations.

Just a point.

davidbfpo