Had this back from askaLibrarian
Thank you for your question, which was passed on to York Library to follow up. We are looking into it and so far the only suggestion we can make is Tenderwire by Claire Kilroy, which was published by Faber last year. It is about a female violinist but unfortunately we don't have a copy here to check the giving birth part. I'll let you know any more information as I get it. York Reference Library
Another suggestion which may amount to nothing, and to late for most of us who don't live in London - but at least there's AskALibrarian for next year's stickler!