Possible Clues:

• Unbetterable advice to the over-keen on viewing
• The House of Lords isn't unique!
• As inimitable as the House of Commons?
• Britain would be without uqual without the House of Lords
• Perfect lady about fifty
• It's unique not to look too closely
• Unmatched? Don't look so narrowly
• Noblewoman crossing line - it's unparalleled!
• In a class by oneself
• House of Commons is beyond compare!