Actor and comedian Mark Davison, one half of sketch duo The Exploding Heads, is Bush's competition this week.
How well can he determine the British public's most "6 out of 10" chocolate bar, and other equally ridiculous questions?
Follow The Exploding Heads on Twitter/X here, and listen to their brilliant podcast Sports Horn.
To play the quiz every week, go to guestimators.com
Email us on hello@guestimators.com
Voicenotes to 07457404279
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Hosts - Andy Bush & Matt Cutler
Producer - Will Nichols
Music - Adam Harrison
Design - Charlie Thomas
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