*Nice analysis, but contibutes nothing to substantiate merging.  
 :* First Student UK has no relationship to North American operations. It will never be a major article, but now that it has been improved - leave it alone. It's not doing any harm. 
 :* First Student Canada - now expanded and referenced. 
 :* "First Student" is not the parent and refers only to operations in the USA. There is no need for a disambiguation page and First Student (United States) should be moved back to it's proper title here, but the article still needs to be improved. If I get some time, I will work on it next week. (It's hard to search on words like First and Student and not get a lot of irrelevant results). Thanks to those who have conributed.