[Solved] Apparently, VTI 4.1 ships with a satellites.xml which has 28.4 (284) set for Astra 2 instead of 28.2 (282) which is what the XMLTV data needs. Change the setting in the satellites.xml for Astra 2 from 284 to 282, then do a rescan of your satellites. (You might also need to check your tuner configuration.) Also the user bouquets will probably need adjusting. However, then, the XMLTV importer seems to work.
I've switched over to VTI Image 4.1. Unfortunately, the Problem is back again. Importer downloads and imports about 30k events for German and UK sources. It then displays the German sources fine but all the uk source epg data is not being displayed... Any ideas?