Possible Clues:

• Ideal example that others are compared to
• Paragon of virtue
• Lord investing pound accepted monetary system
• Dad lost grand spoiling model
• Most prestigious exemplar
• Mature way to poke grandad when tipsy, as mark of excellence
• Green light for Longford to get benchmark of old monetary system
• What would offer an element of reliability?
• Former system for defining currency value
• Benchmark