ThanksBirmingham Archives in the Library of Birmingham have some going back to 1880. Not sure whether yours would be included and whether or not they are subject to the 100 year closure rule. I think from what I read on here that they are a bit slow in answering emails - perhaps Astoness or one of the other regular visitors could advise further.
Maurice
Thanks so much - that saves me a hunt then! I know it was definitely 1920 as it was following the birth of her baby who was born that year.Those records which do survive for Birmingham and Aston Unions seem to be at the Library bit are subject to the 100 year rule so are not normally accessible.