Finally threw out the didn't-flush-properly toilet and replaced it with a Burlington Close Coupled WC. This has the most complicated internals of any WC I've ever seen, not that I've seen many, and has two different volumes and two different flush controls. Resetting these will require a strong drink and a long study of the instructions.

Anyway the question is should the cistern empty completeley after a full flush ?

Also has anyone any experience of these ?