I don't know of any Oliver Haagensen in the family so not sure there's a connection. If your Peter John was the same as mine, his wife's name would have been Maud Florence Bark (or Florence Maud Bark).
I can't find a birth or death, but I found the following 2 marriages involving an Oliver (via FreeBMD):
Oliver P. Haagensen, married Fanny Walton, 1917, Grimsby.
Oliver P. Haagensen, married Louisa S. Hewitt, 1936, Grimsby.
There is a Walter K. Haagensen, born Sept 1925, Grimsby. Mother's maiden name: Walton.
Do these sound familiar?