Hi,
Looking in the "British Phone Books, 1880-1984" at Ancestry I found in 1940, 1942, 1944, 1945 onwards.
BRETTLE F.H. 46 Beresford Drive, Southport, 87449
He seems to stay at this address until 1972, then moves to,
BRETTLE F.H. 36 Norwood Avenue, Churchtown, Southport, 85511
until at least 1983.
Possible deaths,
Frederick Harold BRETTLE Oct 1990 Sefton North 37 252
Birth Date: 16 Dec 1906
Marie BRETTLE Oct 1993 Sefton North
29 Mar 1910
Register number: 39B
District and Subdistrict: 0341B
Entry number: 132
Sefton North would be the correct registration district for Southport.
Regards,
Daisy