Spud
I think that number 28 would have possibly been the correct postal number for the Maternity Hospital. In the 1950 edition of Kelly's Trade directory it puts the hospital next door to the Salvation Army Hostel at 26 Loveday Street. I'm also adding a section of a 1950 OS map for your perusal.
LOVEDAY ST. (4), Steelhouse lane to Lower Loveday street.
MAP G 3 & 4.
EAST SIDE.
H.M. Inspector of Taxes (Income Tax & Land Tax Dept. fifteenth district) (L. W. Collins, inspector)
2 to 5 Gittins Charles E. & Co. Ltd. bldrs.' ironmongers
here is Bailey st
8 Hall & Parkes Ltd. Cycle accessories mfrs. (Simplex ho)
8, 9 & 10 Arden Knitwear Ltd. knitted sportswear mfrs :
16 & 17 Birmingham. Maternity Hospital (Nurses' Hostel)
18 Fellows Frank H. & Sons F.A.I. auctnrs 8 Biddle C.Ltd. pawnbrkrs
18 Shield Alfred Ltd. pawnbrokers
26 Salvation Army Working Men's Hostel & Industrial Sections
Birmingham Maternity Hospital
here are Lench & Vesey streets
44 Rudman J. T. shopkpr
here is Price st
LEFT SIDE.
44A Jelf Wm coffee rms
44B, British Homing World Publishing Co. Ltd. (The)
45 Richardson Mrs. Gertrude, shopkpr
48 Keegan L. M. Ltd. mfrs.' agts
49 Brierley Jas. & Sons Ltd. brush mkrs
50 Sharman Arth. B. & Son, paper mers ..
here are Lower Loveday & Bath streets ...