Often find this issue with many of the older style MySky boxes - first time I had the fault it was the client complaining of the sensation when plugging their iPod into their AV receiver which eventuated from the MySky box via all of the "grounded" parts of the equipment. It was interesting though, I could not feel it (both of us were barefoot) but he and others definitely could. He was a doctor and rambled that I didn't have enough salt in my body

Talking to SKY they weren't really interested and just said the house should be checked by an electrician (which was me, and it was a new build very recently fully tested), left that company and wonder if they ever had any luck getting it sorted with SKY