My grandfather Thomas Cook is proving to be a real problem. He was born in 1898 (his marriage and death certificates give ages that certainly fit) but yet he doesn't appear on the electoral lists until 1925. He was married in 1919 to Ellen Hunt who was also 21 at the time. She doesn't appear until 1928 on the electoral lists (but this is expected).
Marriage certificate details:
Thomas Cook age 21, 9ct 9 Hospital St, B'ham, father Thomas Cook
Ellen Hunt age 21, 9H Hospital St, B'ham, father Charles Hunt
Neither of their families are living at those addresses in the 1919 electoral lists. The addresses don't appear either.
I simply cannot get it - he should appear in the lists as from 1919, but doesn't.