Though they both passed CE & FCC testing, the mk2 is electrically quieter than the mk1 - so it should be *better*, not worse!

You could try taking one of the clip-on ferrites off the home PSU power lead and running the yellow, orange and blue (power, basically) wires through the ferrite (if you can get one turn through the ferrite, this would be good). This might help if the RF receiver is very susceptible to induced noise, though we passed CE and FCC on induced noise too...

Hugo