Where did you find the record you mentioned in original post?
Added-
FreeBMD gives the marriage registration as Apr.-June 1890 in Chorlton district, volume 8c page 953. Since there are only 2 grooms listed but 3 brides it's likely that the Elizabeth on the page was known by both Simpson and Brooks (perhaps she was a widow). Ordering the certificate will show her details and hopefully clear up some of the confusion for you.