I've had a run of books that need to be read before other books that I've yet to read: Speer's own writing before Gitta Sereny's book, Caesar before Augustus, and now Our Man in Havana before The Tailor of Panama.
Indeed, the original reason I wanted to read this was the apparent repetition of plot between Greene and Le Carré. I'm fairly sure this is a book I picked up from the library as a teenager, but stopped halfway through because I found it dull. That does now seem rather odd, and I suspect it was because I wasn't expecting satire. I admit it is a book where having seen the film (which was on Channel 5 a month or two back) helps enormously. Greene's Catholicism lurks throughout, as often, in this case in the form of Wormold's daughter. Mainly it's very wittily done, and it certainly helps to have Alec Guinness and Noel Coward in the back of your mind.
One wonders what MI6 would make of a drawing of some Dyson parts.