Would anyone in Britain even have known what went on in the African colonies of other nations?
I doubt anyway that Belgian colonies were worse than those of other European countries, and certainly not worse than German ones.

Whatever your view of Belgium,
Britain declared war because neutral Belgium was invaded.
That is the fact.
Britain was obliged by treaty to do so.
That is the fact.
The people overwhelmingly supported it.
That is the fact.
The British army is considered by military historians to have done well under competent leadership.
That is the fact.

Greg lied when he said it was untrue he had failed to find any supporting historian.
All of you have failed in that.
That is the fact.