Is there a British equivalent of the American/Canadian Jane Doe?

Well i'm English and generally we just say Joe Bloggs universally although there may be a female version that ive just never come across .

I'm English, and one of my interests is the English language (grammar; spelling; etc.), but I have never come across the female equivalent of "John Doe". The only pseudonyms that I can think of that might come close to what you are looking for are:

1. A.N. Other (this is used in a list of persons who are expected to attend a function, but one or more of the names is not yet known).

2. Joe Soap (and, no, I don't know the origin!)

3. Tommy Atkins (this is used mainly in military circles to denote a soldier, any soldier, a typical soldier. It's supposed to have been used on a sample of a military form to show the ordinary soldiers where to put their name).

I know that none of these suits your purpose, and I'm sorry that I can't be of much help, but I don't think newspaper reporters use a female version of John Doe. If a UK newspaper refers to an unknown, female victim of a crime, it usually begins its report by saying that a woman's body was found at such-and-such a place. After that, it says something like, "the victim; the unknown woman; the dead woman".

Her name would be Jane Doenut. Because the British version of Jane Doe is nutty.