Hi, actually it seems that the space there doesn't make any difference.
But I think I'm figuring out what's going on. I've got a file written on Windows, with a bunch of pound signs £ in it. When I look at it in VIM on OSX, they show up as ? But now I'm thinking that these are not actually question marks, they're the windows character code for the pound sign, which is probably what I need to search and replace.