I happened across this in Google: ec.europa.eu/energy/demand/legislation/doc/2008_02_22_working_document_external_power_supplies.pdf The no-load requirements laid down in the above document would make a transformer-based power supply effectively illegal from about six months after this measure was implemented. The 0.5W no load requirement is lower than needed to deliver the magnetising current of a power transformer. I wonder if you can hear wagons being circled around Salisbury?