So Ecodesigner was complaining about 3 zones it thought were out of date, no amount of updating zones or fiddling about with them cured the problem. I then deleted the 3 offending zones and the associate thermal block, updated all zones and still the error message persists.
After playing about with Ecodesigner project all afternoon, its clear that installing the hotfix released today has stopped Ecodesigner working on this project which was doing just fine this morning.
Regards
Matt