Hi, happy to help if I can, here is the MMI guide to help with the parameters and menu tree,
D series MMi.pdf (5.2 MB)
1st start with the WDC and then tweak the modulation, it goes without saying make one change and see the results, its tricky in the UK as it all depends on the outside temps, as from one day to the next could swing 10 degrees, and may take a few weeks to settle on a good profile for your house.
re the ESPAltherma, check out this great thread,