Princes William and Harry formed a human chain to unload sandbags from an Army vehicle as they joined colleagues from the armed forces in helping to defend Datchet from the floods.
The private visit was unannounced but once news of their work spread, they were followed by journalists and cameramen.
Asked by ITV News whether he was enjoying helping, Prince Harry replied: "Not really with you guys around".
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Robert Gropel asked his wife to wait while he hiked to the peak, not realising she had altitude sickness that would prove fatal.
Severe weather warnings have been issued as up to 60mm of rain is set to fall within just a few hours in some parts.
Tuesday: A cloudy, cool and dull day with outbreaks of heavy rain becoming lighter and patchier.