As a fan of the Carry On series of films, I quite enjoyed this film. It's a harmless tongue-in-cheek take on the misadventures of a group of gas delivery men, with a number of set-piece comic skits in the opening half hour or so that although familiar to anyone who has picked up a saucy seaside postcard, are executed well nonetheless. After that the film does run out of steam a little once the featherweight plot tries to emerge, and the low budget of the film really starts to show through the wobbling set walls. Curiously, at certain points throughout the film the actors switch into a kind of "Public Information film" mode, solemnly instructing the housewives/husbands on the correct way to care for their gastanks, boilers etc - illustrating both the advantages and disadvantages of having a state-funded film industry.
Die hard fans of "Confessions of a..." films might last the distance, but otherwise just stick around for the opening third. And the kitsch song-and-dance opening is inspired!