Well, if you don't have a baptism for him, just where did you get his name and birthyear(s) from?
The one wed to Ann (from Botley). you can search out the marriage.
The certificate will give witness names , and maybe a father if the name was provided at the time.
Marriages Sep 1847 (>99%)
BELCHER William Wantage 6 397
Mace Maria Wantage 6 397
MIDDLETON Joseph Wantage 6 397
Wilkins Ann Eliza Wantage 6 397
BELCHER, CATHERINE WILKINS 1854 J Quarter in WANTAGE Volume 02C Page 284
BELCHER, CHARLES WILKINS 1857 D Quarter in WANTAGE Volume 02C Page 266
BELCHER, FANNY WILKINS 1860 S Quarter in WANTAGE Volume 02C Page 263
Marriages Sep 1847 (Looks like this lot ended up in Blewbury)
BELCHER William Wantage 6 379
BIRMINGHAM Elizabeth Wantage 6 379
BELCHER, MARY ANN BIRMINGHAM 1848 D Quarter in WANTAGE Volume 06 Page 255
BELCHER, JOSEPH BERMINGHAM 1851 M Quarter in WANTAGE Volume 06 Page 305
BELCHER, LOUISA BIRMINGHAM 1852 D Quarter in WANTAGE Volume 02C Page 265
BELCHER, THOMAS BIRMINGHAM 1854 S Quarter in WANTAGE Volume 02C Page 270
BELCHER, WILLIAM BIRMINGHAM 1856 M Quarter in WANTAGE Volume 02C Page 298
BELCHER, JAMES BIRMINGHAM 1858 J Quarter in WANTAGE Volume 02C Page 282
BELCHER, PRUDENCE BIRMINGHAM 1860 J Quarter in WANTAGE Volume 02C Page 286