Give Reasons - The British Government had to withdraw its order in the 1890.
Answers
Assuming that the statement is referring to the British Ultimatum of 1890 by the British government against Portugal, the reason is as follows:
In 1890, Portugal army attempted to capture a lot of area which was under the British colonies of Mozambique and Angola including most of present-day Zimbabwe and Zambia and a major part of Malawi.
Portugal government had to reluctantly accept the ultimatum and had to retreat from those regions.
As Portugal was the oldest ally of Britain, the people of Portugal felt betrayed by the British and this led to the feeling of resentment against the British Empire among Portuguese.
The British Government soon realized that they’re getting more and more politically isolated and hence signed the Treaty of London to reach an agreement with Portugal on the issue of the Mozambique and Angola, thus nullifying the earlier agreement.