Checked possible marriage of James's parents - Edward Clack to Susannah . That James was Edward's grandson and he was born in 1860 so no match.

Would be grateful of your kind offer to search the PRs if you have the time. Especially Cranfield.

Just a thought - James and Lucy might have been married in Hinto Waldrist, where Lucy comes from. If I could find her marriage certificate it might give details of relatives.