Vicky, I think you're going to have to take a chance on that birth certificate if you're to progress with this. We can speculate all we like about what might have happened, but it's worth nothing without the documents.
You can save money on speculative certificates by using the GRO's "checking points" system, whereby you specify something you know to be true of the correct person (e.g. for this birth certificate - that the father's name is Edward or Charles or some combination of the two) and if the certificate doesn't match the checking point you get a partial refund and no certificate.
If the Sheppard birth turns out to be wrong, there are a couple of Shaw ones at the right sort of time - but probably better to start out with the Sheppard one and see what happens.
Anna
