Emergency Call (1952) Yank title The Hundred Hour Hunt
Sure I'd seen this before, but remembered nothing of the plot and ending, so watched it again as it had Jack Warner starring in it, he being one of my favourite actors, and in this he'd been promoted from PC Dixon on the beat to a DI.
Little girl is dying from leukaemia and urgently needs a blood transfusion, but is a very rare blood group and so the chase is on to find three donors...................ALL of whom the doctor (Anthony Steel) and police have trouble finding for one reason or another - each person having their own back story. One of them for instance is the boxer turned actor Freddie Mills, actually playing a boxer in this with his manager being one Sid James who was perfect for the part of playing somebody in the dodgy sleazy world of that sport in the 1950s.
The one unique feature of this was the little girl was the real life daughter of the distraught mother Joy Shelton, who was the wife of Sydney Tafler who was also in the film playing the part of a small time crook. Nothing like getting all the family involved.
Other faces playing minor roles were Thora Hird, Dandy Nichols and Graham Stark.
Worth a watch film actually, with three good sub plots.