The back doors rattle and squeak when the van's going along. How do I stop them, they sound like a couple of amorous guinea-pigs. Grease the catches with something? What?

There is a small amount of adjustment available on the nearside door by loosening the catch plates top and bottom ie floor and roof of the van and pushing them inward, for the offside door you need to adjust the striker pin on the nearside door again inward that usually does the trick.