Guys
A lot would depend on when it happened. If right at the start then so many butterflies. Apart from anything else he had some many impacts over such a long period. Financial reformer, his long opposition to imperialism, championship of free trade, change from reactionary opposed to election reform to 'the People's William', his support of Irish Home Rule, which split the Liberals.
If you presume he never came to promiance then a lot of what he did would probably be promoted by others, but as effectively? Probably see a more conservative Britain, a bit slower to reform and more miltant. Contrary to what Pasha says you would probably see an earlier European scramble for Africa without his attempts at restraint. [On the plus side this could have meant no free state as that was set up initially to try and develop the region without explicit outside control and preserving free access to the area. Unfortunately it ended up with Leopold in charge


]..Might have seen a bigger war at some point depending on how things had developed. Without his high moral attitude dominanting much of the country for so long you might have seen a more realpolitik British policy which could have had impacts in so many places.
Far too many butterflies to tell with any accuracy however. Could have virtually anything.
Steve