Rival DJ Boris a slacker, says Clegg

The rival DJs do not always see eye to eye

Nick Clegg has joked that London's mayor should be known as "Slacker Johnson", for agreeing to do a radio phone-in monthly rather than weekly.

Boris Johnson is to follow in Mr Clegg's footsteps by hosting a phone-in radio show on London station LBC.

But the deputy prime minister, who hosts a weekly show, said that he was not impressed the mayor had signed up for just one a month.

"I want to see Slacker Johnson every week," he joked during the phone-in.

Ask Boris will begin on 2 July and will be a 45-minute morning show - as with Call Clegg it will be co-hosted by presenter Nick Ferrari.

But unlike Call Clegg it will be a monthly show. The Lib Dem leader said on his 30-minute show on Thursday: "I'm going to call him Slacker Johnson from now on. He's only on once a month.

"If imitation is the sincerest form of flattery I'm delighted he is trying to follow in my footsteps, but he should put the hours in."

During the Eastleigh by-election in February Mr Johnson had his own dig at the deputy PM, saying the Lib Dems were "wobbling jellies of indecision and vacillation, especially Clegg".