they did a panto season in stoke a few years ago, a production that included the local breakfast show DJ. before rehearsals began he was bemoaning that it was likely that the brothers would clown around and they'd end up getting nothing done learning the show. as it turned out (and DJ later admitted) the chuckles were 100% professional and the show was soon sorted.
A friend of mine was in panto with them. He said they were awful off-stage. They'd order in a big pile of food and not give any to their supporting cast.