Looking for Smith Tilly

The Smith was dropped in 1940's however there is a line of Smith-Tilly that i am finding
to trace. Any assistance would be appreciated.
Norman Alexander Smith-Tilly Died 10/11/1973 Married Elvie Ellen Connell Died 14/6/1993
Normans father William Smith-Tilly Died 6/1/1949 Married to Muriel Georgina McEvoy.