The Duke of Cambridge and Prince Harry found themselves being treated like everybody else on the BBC show DIY SOS when the resident electrician called them "sausage".
Presenter Nick Knowles revealed the brothers, who helped with a project to turn a derelict street into homes for ex-service personnel, asked to be called "William and Harry" rather than "Your Royal Highness".
But the show's electrician Billy Byrne just referred to them in his usual way - by calling them "sausage", prompting Harry to quip: "If you're going to call me sausage, it's going to be a very long day."
The royals donned personalised hard hats and steel-toe boots in September as they lent a hand with part of the ambitious renovation of two whole streets in Newton Heath, Manchester.
Knowles told the Radio Times: "Having met them before, I was aware they don't particularly want to be walking round a building site and being called 'Your Royal Highness'.
"They told me 'You can call us William and Harry.' So everybody was quite happy to call them that. Apart from our electrician Billy, who called them 'sausage'.
"But then he calls everybody sausage. Harry said to him: 'If you're going to call me sausage, it's going to be a very long day'."
Byrne, who learnt his trade as an electrician in the 1960s and has worked on other BBC programmes such as Holby City, is one of the original members of the DIY SOS squad and known as the team clown.
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