If the Cockermouth chap does match, his parents seem to be Samuel J Lockyer and Mabel Mitchell, who married in the district Q4 of 1911.
Mabel is with her parents at the 1911 census, but the best match for Samuel appears to have been in the Navy.
FreeBMD gives a pretty certain brother for Thomas, born 1915 in Cockermouth. There are three other possible siblings, the first born 1920 in Yarmouth, the others 1921 and 1924 in central London. I won't mention the names here in case they are still living.