Yeah, that seems pretty good. It seems to cover everything it needs to.
On a different topic, this wiki seems to mention books and episode names etc. on in-universe articles. Most wikis (e.g. Star Wars, Hitchhiker's, Harry Potter, Doctor Who) do not mention such things on in-universe articles. Is this Baker Street Wiki policy or simply something that has happened over time? I personally prefer it when books and episodes are not mentioned in in-universe articles as I feel it gives a much cleaner picture and description of the characters and events. What is your view on this?
To be honest it's probably something we should discuss as a community - we have a Manual of Style but it's still a work in progress at the moment.
Personally I think with so many different sources for our articles we need to make sure it's clear what fictional universe the character/location/etc is from - however that doesn't necessarily mean we can't still use the type of style you're referring to. Perhaps we need a line in info boxes that can be filled in to state what universe a character (or whatsoever it is) is from. Because just listing appearances doesn't always make that clear if it's a list of individual episodes rather than the series name, and it also might be better to have it stated right at the beginning of the article. Perhaps we need a line below the characters name in the info box, so it would read for example:
I think your suggestion, the small clear header, is the easiest way to solve this issue. Perhaps a number of small templates need to be created (e.g. Template:Sherlockbbc or Template:Elementary) so that it would be easy to distinguish between and label articles from the different Sherlock universes.
In the Manual of Style, "We use an in universe style for most articles" seems to me to mean not mentioning out of universe things (e.g. episodes names and Conan Doyle books) on in-universe articles, but I suppose that is up to interpretation.
For me, the main annoying thing is the direct mentioning of out of universe titles on in-universe articles. Once an easy way to get round this has been found, I suggest implementing it. The Doctor Who Wiki references its episodes and comic via a bracketed system, while the Hitchhiker's Wiki has recently implemented a <ref> system which is awkward but still functionary. Once a way to do this that suits this wiki has been found, it would be best for it to be put into action.