What is the game effect of the Noble Rank of an Office Block? I don't see any mention of its use in the rules.It's a mnemonic of the bonus Votes that the Office receives in Parliament. You can either just move the Block to Parliament or refer to the Parliament/Office Card.
From the yet-to-be-posted Living Rules:
"10.5 Parliament Cards & Offices
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Note that the Noble Rank on the Block associated with an Office is simply a mnemonic to remember the Votes contributed by holding the Office Card and does not also contribute to Votes in Parliament. E.g. the Lord Chancellor gains a total of +3 Votes in Parliament only, and the Block can be Attached to (and led by) any Noble winning the Office, regardless of the Noble's own Rank."
edit: 1 (added new Living Rules text)