Get someone with copies of Hatings/Bexhill street directories to have a look for some addresses for you and ask the local library there if they have any copies of mid 20th century lists of voters.
Freebmd also lists some Hastings Pritchard births (1927-1929) with mother's maiden surname as Stephens and Morgam.
By the way, a you also on the Genes website, for there are two people there that also share an interest in your Liverpudlian Harold/Harry from 1907-1908.
Roy G