Better still, seeing as it's Aston, order it from Birmingham Register Office and you will get a copy of the original (rather than the GRO transcript), and probably by return of post.
Or you have nothing to lose by ringing and speaking to their genealogist, John Yates - I did so recently to clarify a name on a certificate that was causing some difference of opinions. He looked it up then and there and (as it happened) agreed with my reading of it.