Upvote:7
In 1830 the Netherlands was a minor power, not a great power. The Netherlands had been a rival of England in the mid 17th century but in the early 19th century it was no rival of the United Kingdom. England, Great Britain, and the UK did not like major powers controlling the nearest ports in what is now Belgium.
The 19th century Netherlands was no great power so England had no motive to break it up. When Belgium did revolt The leaders of the UK thought that was good for the UK because the power controlling the ports would now be even more minor. However, it would turn out to be bad for the UK if a major power like France managed to annex Belgium.
So the diplomatic interest of the UK was to do what it could through diplomacy to back the independence of Belgium and to oppose French moves to annex any part of Belgium.
So the UK did not conceive or give birth to Belgium but their statesmen were probably quite willing to be godparents and sponsors at the baptism.