I can report that from 53.5N, I managed to see Iapetus on 2/7/18. It was magnitude 11.2. Saturn was at its culmination altitude of 14 degrees. I used a 12" Newt.
Way down there in the dense atmosphere and thick LP, I have no hope of seeing Hyperion or Phoebe, but Mimas might be possible on the very best nights.
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