I recently shot some interviews on an oil rig in the North Sea off the coast of Scotland. Their electricity supply was at first glance just as per the UK mainland. The interviews themselves were fine - we shot using tungsten lamps and they looked great. Where we developed problems however was while shooting B Roll under fluorescent lighting. The cameras were initially set with 1/50th shutter, however when flickering appeared we changed to 1/60th (assuming the electricity supply must have been 60mhz). This solved the problem for some shots but not others.
A chat with one of the technical staff on the rig revealed that they have their own power supply (as one would expect) that fluctuates in frequency (between 57-60mhz). This has caused some clips to suffer flicker that appears as horizontal bands. It's quite subtle, for the most difficult shots we set the shutter to 1/30th which mitigated the problem but didn't solve it.
Is there anything I can do to fix this? Any plugins available that might help?