Hi Bruce,
Sorry, I should have explained my reply a little more. The current code does plot % demand exactly as you've requested, but it sounds like you're not getting this functionality as the browser is still running the JavaScript code from a previous Domoticz version held in its cache. I can post a screenshot tomorrow, if it helps, to check that I'm understanding exactly what you're describing.
PS I'll add the battery info to my list too to look into. The signal strength doesn't get populated for Evohome devices as it isn't transmitted to the controller.
Dan