Name issue on visa

[kooshball 0]

So, the long version is that my husband has a title in the UK, and it screws up his passport.  Where his name is legally, say, John Joseph Smith, his UK passport says his name is John Joseph Hon John Smith (this, for whatever reason, is the way the UK passport office handles his title; he's checked and tried to fix it already).  The facing page gives his name correctly.  For his visa, however, they've just stripped out the title, and named him John Joseph John Smith (obviously following the information on the bio page).

 

Short version: does the name on the visa have to match the passport or his actual legal name?  We emailed the embassy a month ago when we first received the visa, and haven't heard back from them, and they are absolutely refusing to put any calls through to the immigrant visa unit.  Time is getting pretty tight now before we fly and I'm starting to stress out.  Any light you could shed would be greatly appreciated.