Hi, Sharon and welcome to the forum.
I can only give you the information regarding my own city of Stoke-on-Trent, as I have a complete run of cinema programme details for this city from 1929 to 1979. However, the titles below being new films on general release at the time, this is a pretty good guide as to what new films were showing nationally. It should first be noted that very few cinemas opened on a Sunday in those days, so these are the city centre programmes for the week beginning Monday, April 26th, 1948 (my first birthday):
Odeon: Stewart Granger and Valerie Hobson in BLANCHE FURY (a) Technicolor.
Regent: Eric Portman; Patricia Roc and Anne Crawford in MILLIONS LIKE US (u) also Abbott and Costello in ONE NIGHT IN THE TROPICS (u) plus The F.A. Cup Final
Coliseum and Hippodrome cinemas: Greta Gynt; Jack Warner and Dennis Price in EASY MONEY (a) also Alan Curtis in FLIGHT TO NOWHERE (a) plus The F.A. Cup Final.
Capitol: Humphrey Bogart and Bette Davis in MARKED WOMAN (a) also George Raft and Edward G. Robinson in MANPOWER (a) plus Special Attraction: The Royal Silver Wedding (u).
Danilo and Rio cinemas: Alan Ladd and Veronica Lake in SAIGON (a) also Robert Lowery and Ann Savage in LADY CHASER (a).
Alexandra and Broadway cinemas: Dennis Price and Anne Crawford in MASTER OF BANKDAM (a) also Donald Woods and Brenda Joyce in STEP CHILD (a)
I hope this is of some help.