Two are in the UK municipal sector, and the third is to do with oily industrial effluent in the German-speaking world.
None yet require the equivalent of a Part 35 expert report, and two of them are in any case outside England and Wales where the civil procedure rules apply.
All would be technically interesting even without the added interest of a dispute over the facts and their interpretation.
Hopefully, at least one of these will land next week. Like buses however, they tend to come along in pairs or larger multiples.
Luckily the plant layout book text is written and checked now, so I have a couple of months to make sure all of the illustrations in there are just how I want them.