“If in doubt, blow up Renee’s mother-in-law.” That was the secret of ’Allo ’Allo’s success, apparently. The actors who played Private Helga Geerhart (Kim Hartman), Lieutenant Hubert Gruber (Guy Siner), Herr Otto Flick (Richard Gibson) and Officer Crabtree (Arthur Bostrom) reunite 25 years after the series ended in 1992 to reminisce. And three of them turn up in costume. “I’ve lot the sid down,” says Bostrom. But then, he was always the newbie.