Not quite a stand in but she did get to read the clue.

The most Famous Quest Guest. On Valentines day 2010 Becky had to go to Norwich Museum to collect clue 5 and standing by the clue (meet your predecessor) was as Becky put it "Anneka flippin Rice".

Clue 5 finally led them to The Forum and quite a party was had by all in the Studio with David Clayton getting in a hug

Anneka was the original skyrunner in Treasure Hunt on Channel 4. They did one hunt in Norfolk which is on You Tube. She left the series in 1982 .