I am not at all sure if this is going to help you but some, maybe not all, of Belgrave Terrace does still exist. I used Google maps and entered Belgrave Terrace, Birmingham, West Midlands B21, UK If you orientate the outer ring on street scene so that the N sign is just left of the upright you will be facing the right side of the street. Aim for Thornhill Road and then use the arrows on the bottom of the street scene to manoeuvre to the right. You should then get to Belgrave Terrace which is a small unmade alley to the left of three shops: nearest a red one CASH 2 DAY; next green/white DAVIS WEST INDIAN BAKER; and finally a blue one GENTS HAIRDRESSING. It is also worth a general Google as it seems that there has been some redevelopment. Even numbers still mentioned for sale. I also looked on the 1901 census and found William Winkles (the father his wife Clara on 1891 census) age 43; William H son age 13; Edith M dau age 11; Sidney J son age 7 (born Handsworth); Emma Marchington age 69. I wondered if there was an outside chance that the authorities misheard SJW and put his sister down as Eva instead of Edith. Did you get the information about the money to his sister from his Army Records? If so see if there are another set of records as I have found that these can vary. Like you I drew a blank on a Higginson marriage, but I did find Edith M marrying a Sydney A A Bignell 1938 in Lewisham, London (might not be same person). Keep me posted if I can help further, but I do not live in that part of the country. Regards.