London Mayor Boris Johnson is very proud of his pay-as-you-go rental bicycles installed all over London. William and Kate, who were given a tandem model as a wedding present by the famously shockheaded mayor, are also fans.

It seems the Queen doesn’t share their enthusiasm.

During yesterday’s visit to London store Fortnum & Mason, the following exchange was overheard between the two.

Queen: “At least I didn’t have to come down here on one of your bikes.”

Mayor: “Oh gosh, don’t you like my bikes?”

Queen: “Oh yes, I think they’re lovely. In fact I notice the bike racks are often empty.”